Water basin system

Abstract

Water basin system (1.1, 1.2, 1.3) comprising a pool (2) for swimming and / or bathing, a first water extraction device (3.1, 3.2, 3.3) for the outflow of surface water from the pool (2), wherein the first water extraction device (3.1, 3.2, 3.3) has a first overflow edge (4.1, 4.2, 4.3) at a first level (13), a biological filter device (5) for receiving water from the first water extraction device (3.1, 3.2, 3.3) and a first return device (10) for the recirculation of purified water from the biological filter device (5) to the pool (2), wherein the first return device (10) is designed to be blockable, characterized in that the pool (2) has a second water extraction device (12.1, 12.2) with a first overflow edge (4.1, 4.2, 4.3) at a second level (15) lying second overflow edge (14.1, 14.2), wherein the second level (15) is below the first level (13) and wherein the second water extraction device (12.1, 12.2) a shut-off means (11.1, 11.2) is assigned and / or that the first overflow edge (4.1, 4.2, 4.3) of the first water withdrawal device (3.1, 3.2, 3.3) is designed to be height-variable at least in sections and means for fixing the height setting of the first overflow edge (4.1, 4.2, 4.3) are present.

Description

[0001] The invention relates to a water basin system comprising a pool for swimming and / or bathing and a biological filter device.

[0002] Pool systems with a pool and a biological filtration system in an additional pool are known, for example, from EP 2121527 A1. For water purification, water near the surface of the pool flows through a skimmer flap located on a barrier between the pool and the additional pool to a biological filtration system. After passing through a filter body, the purified water enters a collecting shaft of the filtration system and is then returned to the pool surface in a riser pipe by means of a scooping device driven by the pumping action of an aerator pump.

[0003] A constant flow is required for effective bacterial colonization of the filter body of a biological filter system. Such continuous water circulation in a water basin system can only be safely operated during the winter months with energy-intensive auxiliary heating. Therefore, the entire water basin system is usually shut down well in advance of the frost period, and the biological filter system is allowed to freeze over the winter months. In spring, a pre-activation phase with extended water circulation is necessary for reactivation, during which the biofilm in the filter body builds up again before the water basin system can be used for swimming and / or bathing again.To circumvent this problem, EP 1774121 A2 proposes limiting water circulation in winter to the filter tank with the biological filtration system. This involves lowering the water level and drying out a barrier between the pool and the filter tank that is overflowed during summer operation. During the circulation limited to the filter, the pool is not to be used.

[0004] Furthermore, a combination of biotechnological and physical purification steps for pool cleaning is known. Examples include EP 1727770 A1, FR 2929936 A1, and EP 2282974 A1. These combined purification processes are selected in such a way that they do not pose a threat to the functionality of the biological filtration system. Furthermore, mechanical water purification operated in parallel with a biological filtration system or operating intermittently requires a restriction to biocompatible, coagulating cleaning agents. Furthermore, the equipment required for water filtration is increased.

[0005] The invention is based on the object of providing a water pool system that provides the user with enhanced water purification functionality without having to interrupt swimming or bathing operations in winter. Furthermore, the water pool system should be structurally simple.

[0006] The above-mentioned problem is solved by the features of the independent claim. Advantageous embodiments emerge from the subclaims.

[0007] The inventors assume a water basin system with a pool for swimming and / or bathing, which includes a biological filtration system. This preferably includes a pond section covered with aquatic plants, in which plant roots and algae absorb nutrients from the draining pool water. By seeping into the overgrown pond section, the pre-treated water enters a filter body with a typically multi-layered bed of granular material, on which a biofilm forms through bacterial growth, providing the essential cleaning effect. A return system for the recirculation of treated water from the biological filtration system to the pool advantageously includes a pump designed for continuous operation, so that, when used as a natural pool, the water is constantly circulated by the biological filtration system.This ensures that the sensitive biofilm in the filter body is continuously supplied with nutrients.

[0008] The recirculation system for returning the purified water to the pool is designed to be blockable. In the simplest case, a pump in the recirculation system can be shut down in the event of a blockage. As an alternative means of blocking the recirculation system, a valve arrangement is provided in a connecting line to the pool.

[0009] Furthermore, a generic pool system comprises a first water extraction device for the outflow of surface water from the pool, which provides a first overflow edge at a first level. With an unblocked return device, the permanent return of purified water to the pool requires a constant water outflow via the first overflow edge to the biological filter device, which removes contaminants from the pool's water surface. For this purpose, the first overflow edge has a sufficiently long transverse extension adapted to the pool surface.

[0010] To solve this problem, it is proposed to expand a generic pool system with a biological filtration system so that cleaning can also be carried out using biologically harmful processes, particularly chlorination. Cleaning would then be carried out intermittently and can be adapted to the prevailing outdoor conditions and the desired use. In particular, switching from summer to winter use of the pool in the pool system is possible.

[0011] According to the invention, the biological filter device can be decoupled from the pool to prevent pool water purification agent from being carried over into the filter body of the biological filter device. This makes it possible to switch between bathing in a natural pool and bathing in a chemical water purification system, with the latter particularly involving chlorination of the pool water. This allows the user to choose between naturally filtered water and chemically treated, visually clean pool water. Chemical water purification, in particular chlorination of the pool, is advantageously carried out when there is a high level of pollution input due to intensive sun exposure. Furthermore, chlorination is advantageous for winter use of the pool, as any heating device used for this purpose can be limited to a smaller area with a reduced water volume.

[0012] In order to be able to carry out intermittent chemical pool water purification while simultaneously maintaining swimming and bathing operations, a water pool system according to a first variant of the invention has a second water extraction device with a second overflow edge located at a second level, wherein the second level is below the first level and wherein a shut-off means is assigned to the second water extraction device. For controlled water drainage, a second overflow edge is preferred. The second level is advantageously located far enough above the pool floor that a human user can still comfortably swim and / or bathe when the water level in the pool is at the second level. Thus, the pool remains usable even during chemical water purification.The second overflow edge according to the invention for the outflow from the pool establishes a lowered water level for bathing with chemical water purification, without any further active intervention being necessary to regulate a water level in the pool that is usable for swimming and / or bathing.

[0013] A motorized actuator can be assigned to the shut-off device of the second water extraction device. For a tubular second water extraction device, a control valve in the form of a motorized ball valve or a solenoid valve is suitable. Alternatively, a self-drive mechanism can be omitted in order to achieve a structurally simple design, with manually operable shut-off devices being particularly advantageous. Shut-off devices with at least one removable, rigid dam, for example, a detachable sheet pile wall, or with a movable overflow weir are particularly preferred.

[0014] To switch from a natural pool to a pool with chemical water treatment, the first return device is first blocked. This prevents the recirculation of water from the biological filtration system to the pool, and the shut-off device of the second water extraction device can be set to flow. Consequently, water flows out of the pool, and the higher first overflow edge of the first water extraction device to the biological filtration system becomes dry. The water level in the pool will continue to drop until it reaches the second level.The height difference between the first and second levels is advantageously set such that, during subsequent bathing operations with chemical water purification, pool water is reliably prevented from spilling over the first overflow edge to the biological filter device after the shut-off device of the second water extraction device has been closed again to decouple the biological filter device. Thus, after the average water level in the pool has been adjusted to the second level defined by the second overflow edge, chemical cleaning of the pool water, in particular chlorine treatment, can be carried out. This allows for non-biocompatible cleaning of the pool water without endangering the biological filter device.

[0015] In a preferred embodiment, the biological filter device is designed so that its maximum water level or maximum fill level does not exceed a third level below the second level. Therefore, the first overflow edge preferably forms a step to the biological filter device, or a watercourse with a gradient is provided between the first overflow edge and the biological filter device. The height difference between the second and third levels makes it possible to transfer the pool water flowing over the second overflow edge into the biological filter device and use it as a water reservoir when switching from bathing mode as a natural pool to bathing mode with chemical water purification.The capacity of the biological filter system is adjusted to the volume of water to be removed from the pool, ensuring a sufficient height difference between the second and third levels. To maintain the height difference between the second level and the water level of the biological filter system even under adverse operating conditions, such as heavy rainfall, and to reliably prevent surface water from flowing back to the pool, the biological filter system preferably has a filter overflow at the third level. This overflow provides drainage to the environment and prevents the water level on the filter side from rising above the third level.

[0016] In one alternative design, the second water extraction device does not lead to the biological filtration system. In the simplest case, the pool water near the surface is drained into the sewer via the second overflow edge after the shut-off device at the second water extraction device is opened. This measure is useful when heavy algae growth has formed in the pool and a partial water exchange in the pool and a fresh water supply are required. For another water-saving design, a pool-side water reservoir serves to collect water from the second drainage device, with the pool-side water reservoir being fluidically separated from the biological filtration system.In order to enable a return or recirculation for bathing operations with chemical water purification, a second return device is preferably provided for the recirculation of water from the pool-side water reservoir to the pool.

[0017] For a design with a pool-side water reservoir, the second water extraction device is preferably designed to drain surface water from the pool. Contaminants on the pool's surface then flow over the second overflow edge of the second water extraction device, whose shut-off device assumes the flow position for bathing operations with chemical water purification. The removal of a film of contaminants is particularly efficient if, for an advantageous design, the second overflow edge has a large transverse extension of at least one meter.

[0018] Skimmer flaps offer particularly efficient cleaning of the water surface in the pool. However, in a natural pool it should be borne in mind that a skimmer flap represents a trap for aquatic insects such as water striders. For the water pool system according to the invention, skimmer flaps are therefore preferably only used for bathing operations with chemical water purification. The pool advantageously comprises a skimmer flap to which a manual shut-off device is assigned, or the skimmer flap is designed such that it is fully submerged and closed by the user when the water level in the pool is at the first level, and is set in the operating position when the water level in the pool is at the lower second level. In addition, a water circulation device for bathing operations with chemical water purification is provided for the pool of the water pool system according to the invention.Such a water circulation device, which is fluidically separated from the biological filter device, can be designed for a limited volume flow and can include a physical filter, such as an external sand filter.

[0019] In a preferred embodiment, a physical treatment device and / or an ozone treatment device and / or a UV irradiation device and / or a chlorine treatment device are provided for chemical water purification, which is located downstream of the second water extraction device. These treatment devices can be arranged in the supply line to a pool-side water reservoir. For a structurally simplified embodiment without a pool-side water reservoir, chlorine for bathing can be manually added to the pool water using a chemical water purification system. A chlorine injection device for the pool water, in which chlorine tablets can be stored and which is submerged in the pool for water purification, is advantageous for this purpose.

[0020] The user can choose to use chemical water treatment if the visual appearance of the pool water is impaired by excessive algae growth. This makes it possible to carry out a temporary chemical water treatment without interrupting pool use. Another advantage of the inventive pool system is its extended winter operation. With the onset of the colder season, the biological filter system can be decoupled from the pool. This allows energy-saving temperature control to be used exclusively in the chemically cleaned pool, so that swimming or bathing operations can be maintained even in winter.

[0021] To switch from bathing with chemical water treatment back to bathing as a natural pool, it must first be ensured that the pool water does not contain a concentration of a water treatment agent that would be harmful to the biofilm in the filter body of the biological filtration system. If the pool water has been chlorinated beforehand, the simplest approach is to stop the water treatment and wait until the chlorine content in the water has reduced to a safe concentration through evaporation. To accelerate the evaporation of the chlorine, a water circulation device that increases the free surface area can be provided. A water fountain or a misting system for the pool is conceivable.After this pretreatment of the pool water, the shut-off device of the second water extraction device is closed if it was left open for bathing with chemical water treatment, and then the blockage of the recirculation device is removed. In the simplest case, the pump of the recirculation device is reactivated, so that water is returned from the biological filtration device to the pool, subsequently causing the pool level to rise until the first overflow edge of the first water extraction device is reached again, and a continuous outflow of surface water from the pool into the biological filtration device at the first level occurs.

[0022] For a water basin system according to a second variant of the invention, the first overflow edge of the first water extraction device is designed to be height-adjustable, at least in sections. Additionally, the first water extraction device comprises means for fixing the height setting of the first overflow edge. The first water extraction device is preferably designed such that a height-adjustable overflow edge can be lowered to a second level below the first level and / or raised to a fourth level above the first level.

[0023] For a preferred embodiment of the first water extraction device with a height-adjustable first overflow edge, at least one removable, rigid dam is provided. A sheet pile wall is particularly preferred, the height of which the user can adjust by removing or adding dams. In a further preferred embodiment, the first water extraction device comprises a movable overflow weir.

[0024] After blocking the return device from the biological filter system to the pool, in the second variant, the first overflow edge can be lowered to the second level and fixed in this position for switching to bathing mode with chemical water purification. The water flowing out of the pool is then, as in the first variant, preferentially fed into the biological filter system and stored there. To do this, it must be ensured that its maximum water level or maximum fill level does not exceed a third level, which is below the second level associated with the lowered first overflow edge. After the pool has been drained to the second level, the first overflow edge of the first water extraction device is raised again to disconnect the biological filter system.The lifting is preferably carried out at least to the first level, and preferably to a fourth level above the first level, and then secured again in this position. Bathing operations can then resume with chemical water purification.

[0025] To ensure that the first overflow edge of the first water extraction device is not overflowed during heavy rain and that chemically treated pool water is not carried into the biological filter device, a closable water outlet to the outside environment is preferably provided in a wall of the pool at a height between the first and second levels. Such a closable water outlet, serving as overflow protection, can also be used for the first variant of the invention. In addition, for the second variant, a manually closable skimmer flap can also be provided in the pool wall, the operating position of which is at the second level or to which a shut-off device is assigned, which is set to pass only for bathing with chemical water purification.

[0026] For a further preferred embodiment of the second variant of the water basin system according to the invention, the height-adjustable first overflow edge is raised and fixed to a higher fourth level when switching from bathing mode as a natural pool to bathing mode with chemical water purification. Accordingly, the first overflow edge falls dry and the biological filter device is decoupled. Additionally, a design without a step from the first water extraction device to the biological filter device is conceivable. In this case, the first overflow edge at the first level when bathing mode as a natural pool is just below the water level, which is the same in the pool and in the biological filter device. By raising the first overflow edge to the fourth level, the first overflow edge acts as a barrier between the pool and the biological filter device.

[0027] In a preferred embodiment, the biological filter device has a collection shaft on the filter side. In addition, a filter circulation device is preferably provided, fluidically separated from the first recirculation device, with a filter circulation pump drawing water from the collection shaft on the filter side. This allows a circulating flow within the biological filter device to be maintained, keeping the biofilm alive, even during uncoupled pool operation.

[0028] For a further development of the water pool system according to the invention, the two variants of the invention are combined. Consequently, a first water extraction device with a height-adjustable first overflow edge is provided, which drains to the biological filter device. Thus, near-surface pool water, along with the aquatic insects that need protection, can be transported to the biological filter device and stored there. In addition, a second water extraction device with a second overflow edge simplifies chemical water purification at a defined lowered water level for bathing and swimming when the biological filter device is decoupled.

[0029] The invention is explained in more detail below using exemplary embodiments in conjunction with figures. These figures show the following in detail: Fig. 1: shows a first embodiment of the water basin system according to the invention for bathing as a natural pool, Fig. 2: shows the first embodiment of the water basin system according to the invention for bathing with chemical water purification, Fig. 3: shows a second embodiment of the water basin system according to the invention for bathing as a natural pool, Fig. 4: shows the second embodiment of the water basin system according to the invention for bathing with chemical water purification, Fig. 5: shows a third embodiment of the water basin system according to the invention for bathing as a natural pool, Fig. 6: shows the third embodiment of the water pool system according to the invention when changing from bathing operation as a natural pool to bathing operation with chemical water purification and Fig. 7: shows the third embodiment of the water pool system according to the invention for bathing with chemical water purification.

[0030] Fig. Figure 1 shows a first embodiment of the inventive water basin system 1.1 with a pool 2 for swimming and / or bathing. Surface water continuously flows from the pool 2 to a biological filter device 5 located below the first overflow edge 4.1 at a first water extraction device 3.1 with a first overflow edge 4.1 for the illustrated bathing operation as a natural pool. This biological filter device 5 has a filter body 6 coated with a biofilm, through which the incoming pool water seeps for cleaning and exits again in a collecting shaft 7. Water circulation is continuously maintained by means of a pump 8 drawing water from the collecting shaft 7 and connected to a connecting line 9 leading into the pool 2, collectively referred to as the first recirculation device 10.

[0031] To switch to bathing operation with chemical water purification, the first recirculation device 10 is first blocked by stopping the pump 8. Then, as described by Fig. 2 illustrates the release of a shut-off device 11.1 at a second water extraction device 12.1, whereby the water level in pool 2 drops and the first overflow edge 4.1 of the first water extraction device 3.1, which is located at a first level 13, dries out. Thus, the biological filter device 5 is decoupled. The resulting lower water level in pool 2 is fixed by a second overflow edge 14.1 at a second level 15 at the second water extraction device 12.2, wherein the second level 15 is below the first level 13. One or more rigid dams can be used as the shut-off device 11.1. A sheet pile wall or an overflow weir are particularly advantageous for this purpose.

[0032] The water flowing out of pool 2 via the second overflow edge 14.1 of the second water extraction device 12.1 enters a pool-side water reservoir 16. From there, the water is pumped back to pool 2 by means of a second recirculation device 17, which comprises a further pump 18, so that near-surface contaminants are constantly removed into the pool-side water reservoir 16 for bathing operations with chemical water purification. This reservoir contains a physical treatment device 19 and / or a UV irradiation device 20. An ozone treatment device 21 and / or a chlorine treatment device 22 are used for chemical water purification. For a simplified embodiment, chlorine is manually introduced into pool 2 by the user. A chlorine introduction device 23, which is submerged in the pool and in which chlorine tablets can be stored, is advantageously used for this purpose.

[0033] To protect the biofilm in the filter body 6, a constant flow through the biological filter device 5 is also provided for bathing operations with chemical water purification. For this purpose, a filter circulation pump 24 is used, which draws water from the collection shaft 7 and pumps water into a separate filter circuit 25.

[0034] To return to bathing in a natural pool, in the case of chlorine treatment of the pool water, the system first waits until a sufficiently reduced chlorine concentration has been reached through evaporation. Then, after closing the shut-off device 11.1, water can be returned from the pool-side water reservoir 16 via the second return device 17 until the water level in pool 2 again reaches the first level 13 and an outflow to the biological filter device 5 occurs. Alternatively, the additional water can also be taken from the first filter body 6 via the first return device 10.

[0035] Fig. 3 and Fig. 4 shows a second embodiment of the water pool system 1.2 according to the invention. The same reference numerals are used for the components identical to those in the first embodiment. A second water extraction device 12.2 is shown, which is tubular and arranged in the pool wall facing the biological filter device 5. A valve is provided as the shut-off device 11.2 on the second water extraction device 12.2, and the second overflow edge 14.2 is integrated into the shut-off device 11.2.

[0036] Fig. Figure 3 shows bathing operation as a natural pool for which near-surface water from pool 2 constantly flows out to the biological filter device 5 via the first overflow edge 4.2 of the first water extraction device 3.2 at the first level 13. For chlorine treatment of pool 2, the pump 8 in the connecting line 9 is first stopped. Then the shut-off device 11.2 is set to the through position, and pool water flows out via the second water extraction device 12.2 to the biological filter device 5 and is stored there. To ensure that the water level in the biological filter device 5 does not rise above a third level 26, which is below the second level 15 defined by the second overflow edge 14.2, a filter overflow 27 is provided for the biological filter device 5, which provides drainage to the outside environment.

[0037] After the water level in pool 2 has dropped to the second level 15, the shut-off device 11.2 on the second water extraction device 12.2 is moved into the closed position, thus disconnecting the biological filter device 5. To enable bathing with chemical water purification, a closable water outlet 28.1 is provided in a pool wall, located between the first level 13 and the second level. In the open position, the closable water outlet 28.1 prevents overflow of pool 2 in the event of heavy rain and protects the biological filter device 5 from the ingress of the chemical water treatment agent.

[0038] Additionally, a manually lockable skimmer flap 32 is located on the wall of pool 2, to which a water circulation device (not shown in detail) is connected. The skimmer flap 32 is designed to be effective only for bathing operations with chemical water purification. For this purpose, the skimmer flap 32 is positioned so that it is provided with a closure, as shown in Fig. 3, when the water level in pool 2 is at the first level 13, the operating position is only present for a water feature in pool 2 at the second level 15.

[0039] For those in the Fig. 3 and Fig. In the simplified embodiment of the inventive water pool system 1.2 shown in Figure 4, a manual chlorine treatment is preferably carried out. This embodiment is particularly advantageous when bathing with chemical water purification represents only a short-term use. Accordingly, a filter circulation pump for the biological filter device 5 can be dispensed with. Winter operation, during which the biological filter device 6 freezes, can also be implemented as bathing operation with chemical water purification and a decoupled biological filter device 6. In this case, a heating device for the pool 2 (not shown in detail) can be designed to be smaller and more energy-efficient, since only the pool water needs to be tempered.

[0040] Fig. Figures 5 to 7 show a third embodiment of the water basin system 1.3 according to the invention, wherein the first overflow edge 4.3 of the first water extraction device 12.3 is designed to be height-adjustable. Shown is a movable overflow weir 29 arranged for this purpose on the pool wall leading to the biological filter device 5, which has a paddle body that can be tilted about a horizontal axis of rotation 33. Fig. 5 shows a fixed position for which the first overflow edge 4.3 defined by the upper edge 30 of the blade body lies on the first level 13. Thus, Fig. 5 bathing operation as a natural pool, for which water constantly flows from the pool 2 over the first overflow edge 4.3 to the biological filter device 5 located on the third level 26.

[0041] For the Fig. 6, the movable overflow weir 29 is set flatter after the pump 8 has been stopped, so that the upper edge 30 of the blade body and consequently the first overflow edge 4.3 is lowered to the second level 15. This results in drainage of the pool 2 into the biological filter device 5 until the pool-side water level reaches the second level 15. It can be seen that the manually closable skimmer flap 32 in the pool 2 is then set to the operating position. As shown in Fig.7, the movable overflow weir 29 can then be positioned vertically. The upper edge 30 of the blade body, and thus the first overflow edge 4.3, is then located at a fourth level 31 above the first level 15 for safe bathing with chemical water purification. Raising the first overflow edge 4.3 in this way prevents water from overflowing from the pool 2, thus adequately isolating the biological filter device 5. A chlorine injection device 23 can be used for subsequent chlorine treatment of the pool water. Additionally, as a safety measure, a closable water outlet 28.2 in the pool wall located between the first and fourth levels is opened.

[0042] The invention has been described using exemplary embodiments. Without departing from the scope of protection described by the applicable claims, numerous further embodiments for implementing the inventive concept will become apparent to those skilled in the art without the need for further explanation within the scope of these statements. List of reference symbols 1.1, 1.2, 1.3 Water basin system 2 pools 3.1, 3.2, 3.3 first water intake device 4.1, 4.2, 4.3 first overflow edge 5 biological filter device 6 filter bodies 7 collection shaft 8 Pump 9 Connecting line 10 first return facility 11.1, 11.2 Barriers 12.1, 12.2 second water extraction device 13 first level 14.1, 14.2 second overflow edge 15 second level 16 pool-side water reservoir 17 second return facility 18 Pump 19 physical treatment facilities 20 UV irradiation device 21 Ozone treatment facility 22 Chlorine treatment facility 23 Chlorine injection device 24 Filter circulation pump 25 separate filter circuit 26 third level 27 Filter overflow 28.1, 28.2 lockable water outlet 29 movable overflow weir upper edge 30 top edge 31 fourth level 32 Skimmer flap 33 axis of rotation QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 2121527 A1

[0002] EP 1774121 A2

[0003] EP 1727770 A1

[0004] FR 2929936 A1

[0004] EP 2282974 A1

[0004]

Claims

[1] Water basin system (1.1, 1.2, 1.3) comprising a pool (2) for swimming and / or bathing, a first water extraction device (3.1, 3.2, 3.3) for the outflow of surface water from the pool (2), wherein the first water extraction device (3.1, 3.2, 3.3) has a first overflow edge (4.1, 4.2, 4.3) at a first level (13), a biological filter device (5) for receiving water from the first water extraction device (3.1, 3.2, 3.3) and a first return device (10) for the recirculation of purified water from the biological filter device (5) to the pool (2), wherein the first return device (10) is designed to be blockable, characterized bythat the pool (2) has a second water extraction device (12.1, 12.2) with a second overflow edge (14.1, 14.2) located at a second level (15), wherein the second level (15) is below the first level (13) and wherein a shut-off means (11.1, 11.2) is assigned to the second water extraction device (12.1, 12.2) and / or that the first overflow edge (4.1, 4.2, 4.3) of the first water extraction device (3.1, 3.2, 3.3) is designed to be height-variable at least in sections and means are provided for fixing the height setting of the first overflow edge (4.1, 4.2, 4.3). [2] Water basin system according to claim 1, characterized by that the biological filter device (5) is designed such that the maximum water level of the biological filter device (5) does not exceed a third level (26) lying below the second level (15). [3] Water basin system according to claim 2, characterized bythat there is a filter overflow (27) on the third level (26) at the biological filter device (5). [4] Water basin system according to one of the preceding claims, characterized by that the first water extraction device (3.1, 3.2, 3.3) and / or the shut-off means (11.1, 11.2) of the second water extraction device (12.1, 12.2) comprises a removable, rigid dam or a movable overflow weir. [5] Water basin system according to one of the preceding claims, characterized by that the first water extraction device (3.1, 3.2, 3.3) comprises a height-variable overflow edge which can be lowered to a second level (15) lying below the first level (13) and / or raised to a fourth level (31) lying above the first level (13). [6] Water basin system according to one of the preceding claims, characterized bythat a pool-side water reservoir (16) is provided for receiving water from the second water extraction device (12.1, 12.2), wherein the pool-side water reservoir (16) is fluidically separated from the biological filter device (5) and a second return device (17) is provided for the recirculation of water from the pool-side water reservoir (16) to the pool (2). [7] Water basin system according to one of the preceding claims, characterized by that the second water extraction device (12.1, 12.2) is followed on the outflow side by a physical treatment device (19) and / or a UV irradiation device (20) and / or an ozone treatment device (21) and / or a chlorine treatment device (22). [8] Water basin system according to one of the preceding claims, characterized by that there is a chlorine introduction device (23) for the water in the pool (2). [9] Water basin system according to one of the preceding claims, characterized by that the second water extraction device (12.1, 12.2) is designed to withdraw surface water from the pool (2). [10] Water basin system according to one of the preceding claims, characterized by that the pool (2) comprises a skimmer flap (32), wherein the skimmer flap (32) is assigned a shut-off device or wherein the skimmer flap (32) is designed such that for a water level in the pool (2) at the first level (13) the skimmer flap is fully submerged and for a water level in the pool (2) at the second level (15) the skimmer flap is in the operating position. [11] Water basin system according to one of the preceding claims, characterized bythat the biological filter device (5) has a filter-side collecting shaft (7) and a filter circulation device which is fluidically separated from the first return device (10) and has a filter circulation pump (24) which draws from the filter-side collecting shaft. [12] Water basin system according to one of the preceding claims, characterized by that in a wall of the pool (2) there is a closable water outlet (28.1, 28.2) to the outside environment at a height between the first level (13) and the second level (15).

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