Filter media, filter media support and filtration unit for a basin, including a swimming pool

Abstract

The invention relates to a molecular filter medium (1) and a filter medium support (10) for a water filtration unit in a basin, particularly a swimming pool. The filter medium (1) is a consumable and comprises a plurality of permeable, flexible, closed filter bags (2) containing one or more molecular filtration substrates, such as activated carbon derived from coconut shells, for trapping cyanuric acid molecules. The filter medium support (10) comprises a lower flange (11) and an upper flange (12) connected by a hollow central tube (13). The flanges are perforated to allow the passage of water and have upper and lower hooks (14) for attaching the filter bags (2) of the filter medium (1).This filter medium (1) provides molecular filtration of water thanks to the absorbent properties of activated carbon and any other filtration substrate, and thus controls the concentration of stabilizer in chlorinated water and any other contaminant. Figure for the abbreviation: Fig 2.

Description

Title of the invention: Filter media, filter media support and filtration unit for a basin, in particular a swimming pool. Technical field

[0001] The present invention relates to a molecular type filter medium, a support for filter media, and a filtration unit comprising said support for filtering water from a basin, in particular a swimming pool. Previous technique

[0002] Filtration systems for ponds, particularly swimming pools, are well-known and essential equipment for ensuring clear and healthy water, such as the one described in publication WO 03 / 028847 A1 belonging to the applicant. The described filtration system allows for the continuous or intermittent cleaning of pond water, depending on the pond's operating conditions. To this end, a hydraulic pump with a centrifugal turbine and suction effect is mounted in the filtration system downstream of a filtration unit to draw water from the pond's surface by creating a vacuum through the filtration unit and then discharge it back into the pond near the suction point. This embodiment is not limiting, and any other type of filtration system and / or pump is compatible with the invention.

[0003] The filtration unit may include one or more known types of filter media, such as sand of various grain sizes, textile filters, and the like, contained in filter bags or interchangeable filter cartridges. Filtration can be carried out at two levels: particulate filtration to remove impurities and organic matter, and molecular filtration to remove byproducts of pool maintenance, such as those created by chlorine or by the degradation of organic matter present in the pool. Indeed, chlorine treatment is essential to ensure effective water disinfection and safe swimming. However, chlorine is sensitive to ultraviolet rays and degrades rapidly. Furthermore, organic matter, such as leaves and other plant matter, may be present in the pool water and decompose.

[0004] To avoid constantly adding chlorine, it is known to stabilize the chlorine by adding a stabilizing agent, such as cyanuric acid, in a controlled quantity. The drawback is that cyanuric acid is not consumed and accumulates in the pool water. The ideal stabilizer dosage is 20 to 30 mg / l. A dosage of 50 to 60 mg / l is acceptable but must be monitored. However, if the stabilizer level exceeds 70 mg / l, then the water is over-stabilized. The consequence is that the disinfecting action of chlorine is degraded, or even inhibited. Fungi and Algae will begin to proliferate in the pool. It is therefore advisable to regularly drain part of the pool and replace at least half of the water to dilute the cyanuric acid and lower the concentration below the threshold of 70 mg / L. To avoid this problem, it is necessary to regularly monitor the water parameters, and in particular its cyanuric acid concentration, which is particularly inconvenient.

[0005] The degradation of organic matter can also generate by-products or derivatives, such as phosphates or nitrates, the concentration of which can be beneficial to the proliferation of algae. It is therefore also important to regularly check for their presence and eliminate these contaminants where necessary.

[0006] To overcome this drawback, it is known to add a molecular filter medium, such as activated carbon, to the filtration system to trap cyanuric acid molecules by adsorption and thus slow the growth of the stabilizer level in the water. Activated carbon has other advantages and also allows for the adsorption of organic matter and certain contaminants present in the water, the elimination of odors and bad tastes, and the clarification of pool water. In his article, R. Potwora also demonstrated the affinity between activated carbon and the four forms of THMs (R. Potwora, “Trihalomethane Removal with Activated Carbon,” Water Conditioning & Purification, pp. 22–24, June 2006). THMs (trihalomethanes) and chloroform are formed in water when the chlorine used for disinfection reacts with organic compounds. These chlorinated organic compounds represent a danger to public health and their elimination is necessary.

[0007] Activated carbon is most often made from charcoal, but can also be made from coconut shells or wood coal. It is called activated carbon because it has undergone treatments that make it even more porous through specific surface chemistries that give it a greater affinity for target molecules. This quality makes it particularly attractive to molecular contaminants and impurities. Thus, it has a high filtration and adsorption capacity.

[0008] Activated carbon is mainly used in the form of granules or blocks, deposited loose in the upper part of a sand filter or directly in the skimmer basket. There are also pool filters with activated carbon or activated carbon cartridges, which must be changed at least once a year. However, activated carbon is eroded by water and releases fine particles, also called activated carbon dust, which pass through the cartridges and particulate filters, end up in the water, and settle at the bottom of the pool. This drawback compromises the efficiency of the filtration system, which can become clogged, and degrades the water quality as well as the aesthetics of the entire pool. It adds a burden in terms of pool cleaning and maintenance of the filtration system. Furthermore, the Activated carbon, which adsorbs rather than destroys microorganisms, must be changed regularly to maintain its effectiveness. If used in bulk, replacing used activated carbon with new is a complex process and a source of dust and dirt.

[0009] Furthermore, particularly following contamination by algae, the level of phosphates (PO4) can increase to levels detrimental to bathing water quality. It is therefore necessary to be able to remove them, notably using liquid phosphate removers, which must be handled and dosed with care. Presentation of the invention

[0010] The present invention aims to overcome these drawbacks by proposing a new filter medium comprising, in particular, activated carbon, but also solid antiphosphates and any other molecular filtration substrate. This medium is a consumable that is easy to store, use, and handle, and remains clean, as the erosion of the filter materials is contained within the filter medium. It is designed universally to be adapted or easily adaptable to any type of filtration unit, and it contributes to a circular economy, as this medium is compostable. It provides an ecological solution for detoxifying pool water and reducing the concentration of stabilizers and / or other contaminants such as phosphates, nitrates, THMs, chloroform, and / or other heavy metals. The invention also relates to a filtration unit specifically adapted to this new filter medium and facilitating its replacement.

[0011] To this end, the invention relates to a molecular type filter medium, characterized in that it comprises at least one permeable, flexible, closed filter bag to delimit a closed internal volume, containing at least one solid filtration substrate, arranged to trap molecular contaminants transported by the water to be treated, and in that said filter bag constitutes a consumable.

[0012] The filter bag may have a shape selected from the group comprising a cylindrical tube closed at both flattened ends, a tetrahedron, or a polyhedron. It may advantageously include means for attaching to a support, said means for attaching to a support being disposed at least in one end of the bag.

[0013] Said at least one solid filtration substrate may be selected from the group comprising activated carbon granules, zeolites, clay beads, anti-phosphate resin grains, silver grains, arranged to trap contaminants selected from the group comprising cyanuric acid, phosphates, nitrates, THMs, chloroform, heavy metals. In the case of activated carbon, it may be derived from coconut shells.

[0014] Said filter pocket can be made of a non-woven, non-woven, woven, knitted and / or braided textile product, from yarns, filaments and / or fibers of a preferably recyclable synthetic material, chosen from the group comprising polypropylenes (PP), polyethylene terephthalates (PET), polyethylenes (PE), or a combination of these materials.

[0015] Said filter medium advantageously comprises N filter pockets, the filter pockets being able to contain the same filtration substrate or at least two different filtration substrates. The N filter pockets can be linked together to form a string.

[0016] The object of the invention is also achieved by a filtering media support, characterized in that it comprises means for receiving a filtering media as defined above.

[0017] The filter media support may comprise a reel including two parallel flanges and a central tube connecting the two flanges, at least one of the flanges including the means for receiving the filter media, which may include at least one hook. In this case, the fastening means provided on the filter media include at least one opening for receiving the hook.

[0018] If said filtering medium comprises N filter pockets, then the N filter pockets are advantageously arranged around the central tube of said support, extend parallel to said central tube, and are attached to at least one of the two flanges of said support.

[0019] In addition, at least one of the flanges of said filter media support may advantageously include a peripheral seal arranged to form a regulating valve.

[0020] The object of the invention is finally achieved by a filtration unit comprising a tank provided with at least one inlet orifice and one outlet orifice to allow circulation of the water to be treated, said tank comprising at least one molecular filtration stage comprising at least one filter media support as defined above.

[0021] Said tank may include at least two superimposed filtration stages, including a molecular filtration stage and a particulate filtration stage, said molecular filtration stage being preferably located downstream of said particulate filtration stage, and the two filtration stages being separated from each other by the peripheral seal forming a regulating valve, provided on one of the flanges of said filter media support.

[0022] Said filtration unit can be designed in a modular manner, the ratio between the height of the molecular filtration stage and the height of the particulate filtration stage being adjustable and determined according to the filtration requirements.

[0023] Another object of the invention is the use of the filter media as defined above, without support, placed directly in the upper part of a sand filter and / or in the basket of a skimmer and / or hung inside a filter sock. Brief description of the drawings

[0024] The present invention and its advantages will become more apparent from the following description of several embodiments given by way of non-limiting examples, with reference to the accompanying drawings, in which:

[0025] [Fig. 1] is an axial cross-sectional view of a filtration unit comprising a filter media support according to the invention,

[0026] [Fig.2] is a perspective view of the filter media support entering the unit of filtration of the [Fig.l],

[0027] [Fig.3] is a view similar to [Fig.2] of the support alone without filter media,

[0028] [Fig.4A] is a top view of a filtering medium contained in the support of [Fig.2],

[0029] [Fig.4B] is a front view of the filtering medium of [Fig.4A],

[0030] [Fig.5] is a perspective view of a filtering medium according to a variant of realization, and

[0031] [Fig.6] is a perspective view of a filtering medium comprising several pockets filtering elements connected in a string. Description of the implementation methods

[0032] In the illustrated embodiments, identical elements or parts bear the same reference numbers. Furthermore, terms with a relative meaning, such as vertical, horizontal, right, left, front, back, above, below, etc., should be interpreted under normal conditions of use of the invention, as shown in the figures. The X, Y, and Z axes are defined by an orthonormal coordinate system illustrated in [Fig. 1]. Moreover, the geometric positions indicated in the description and claims, such as "perpendicular," "parallel," and "symmetrical," are not limited to the strict sense defined in geometry, but extend to geometric positions that are close, that is, that allow a certain tolerance within the technical field considered, without affecting the result obtained.This tolerance is notably introduced by the adverb "sensible", without this term necessarily being repeated before each adjective.

[0033] With reference to the figures, the filter medium 1 according to the invention is intended to enter a filtration unit 100, an example of which is shown in [Fig. 1]. In this example, the filtration unit 100 comprises a tank 101 having a substantially cylindrical shape along the Z-axis, provided with a bottom 102 and a removable lid 103. The shape of the filtration unit 100 is not limited to a specific shape cylindrical but may have any other shape adapted to the filtration system or group into which it enters and / or to which it is hydraulically coupled. The bottom 102 has a double bottom delimiting a distribution chamber 104. The distribution chamber 104 has at least one inlet port 105 and one outlet port 106, connected respectively to suction and discharge lines for the water to be treated (not shown).

[0034] The filtration unit 100 comprises two superimposed filtration stages, including a molecular filtration stage 107 in the lower part and a particulate filtration stage 108 in the upper part of the tank 101. The cover 103 of the filtration unit 100 is assembled to the tank 101 by any removable means, such as screwing, clipping, bayonet fitting, and the like. A peripheral seal 109 can be fitted to the tank 101 to seal the assembly area with the cover 103. The cover 103 is removable so that it can be opened or removed to access the filtration stages 107 and 108 for changing the filter media, which are consumables. In the illustrated example, the two filtration stages 107, 108 are superimposed and centered relative to each other and to the tank 101, by complementary interlocking shapes provided on each of the supports.When the lid 103 is closed, it presses on the upper stage along the Z axis and ensures that the filtration stages 107, 108 are held together without play in said tank 101.

[0035] The flow of the water to be treated in the filtration unit 100 is represented by the arrows F, from the inlet 105 of the water to be treated to the outlet 106 of the treated water, passing first through the lower stage 107 which provides molecular filtration, then through the upper stage 108 which provides particulate filtration, before passing through a central conduit 110 which runs through both stages to the distribution chamber 104. The molecular filtration stage 107 is therefore located downstream of the particulate filtration stage 108. The two filtration stages 107, 108 are separated from each other by a peripheral seal 15, forming a regulating valve, provided on the lower support, as explained later. Of course, any other design of filtration unit 100 may be suitable, and the number of filtration stages and their arrangement may vary.

[0036] Furthermore, the filtration unit 100 is designed in a modular fashion and can be adapted on a case-by-case basis according to the needs, the materials to be filtered, and the contaminants to be trapped. In the example shown, the two filtration stages 107 and 108 each occupy approximately 50% of the volume of the tank 101. The volume of the tank 101 can be distributed differently by modifying the height of the two filtration stages, respectively, to increase the volume of molecular filtration relative to the volume of particulate filtration or vice versa, depending on the filtration capacity requirements.

[0037] The molecular filtration stage 107 is shown in more detail in Figures 2 and 3. It comprises a support 10 shown respectively with and without filter media 1. In this example, the filter media support 1 has a reel shape comprising two parallel flanges, a lower flange 11 and an upper flange 12, connected to each other by a central tube 13 along the Z-axis. The support 10 thus adopts a vertical position in the filtration unit 100, as shown in the figures. The flanges 11 and 12 are perforated to allow the passage of water in the forward flow direction. Similarly, the central tube 13 is hollow and partially defines the central conduit 110 to allow the passage of water in the reverse flow direction. The length of the central tube 13 defines the height of the molecular filtration stage 107 and is therefore variable depending on the requirements.

[0038] In the example shown, at least the upper flange 12, or preferably both flanges 11 and 12, have receiving means 14 for the filter media 1. More specifically, these receiving means 14 have upper and lower hooks, arranged opposite each other, and adapted to cooperate with corresponding orifices 4 provided in the filter media 1. These receiving means 14 allow for easy and quick assembly and disassembly of the filter media 1. They also allow for the correct positioning and retention of the filter media 1 in the filtration stage 107 with respect to the direction of water flow, and prevent buoyancy effects. Of course, any other receiving means 14 allowing for quick and reversible assembly of the filter media 1 is possible.

[0039] The upper flange 12 of the media support 10 is arranged to receive a flat peripheral seal 15, a lip seal, or similar. This peripheral seal 15 can be housed in a peripheral recess 16 and held in place by a push-fit, or fixed to the flange 12 by any other technical means. It performs several functions: it directs the water to be treated towards the filter media 1, and forms a regulating valve arranged to open or close a peripheral passage for water between the two filtration stages 107, 108. In the event of clogging at the lower filtration stage 107, the seal 15 deforms and lifts at least partially under the effect of a vacuum, thus opening a passage for water outside the filter media 1. In this case, the water does not pass through the filter media 1, but the nominal water flow rate defined by the pump of the filtration unit is restored.

[0040] In the example shown in [Fig.2], the filter medium 1 comprises N filter pockets 2, arranged around the central tube 13 of the support 10. They extend parallel to the central tube 13 and to the direction of flow of the water to be treated, and are attached to the two flanges 11 and 12 of the support 10 via the receiving means 14.

[0041] With reference also to Figures 4A, 4B and 6, the filter medium 1 may comprise one or more filter pockets 2, each containing one or more substrates filtration (not visible), in solid phase, preferably in granular form and packaged in bulk. The number N of filter bags 2 can be, for example, between 1 and 50, depending on the shape and dimensions of the filter bags 2 and the flow rate of water to be treated, without these values ​​being limiting.

[0042] The filter bags 2 can have different sizes, volumes, and shapes depending, in particular, on the support 10 that receives them and the flow rate of water to be treated. In the example shown, the filter bags 2 are formed of a cylindrical tube 3, the two ends 5 of which are flattened and closed to define a closed internal volume suitable for containing a filtration substrate. Each end 5 has fastening means 4 that complement the receiving means 14 provided in the filter media support 10. In the example shown, the fastening means 4 consist of holes that can slide onto the hooks of the support. The number of holes may be greater than one, and only one end 5 may have them, depending on the receiving means 14 of the support.

[0043] According to [Fig. 6], when the filter media 1 comprises several filter pockets 2, these can be attached to one another by a link 6 to form a string 20. In this case, the link 6 passes through the opening 4 provided in one of the ends 5 of the filter pockets 2, the other end 5 remaining free to hang the filter media 1 in the support 10. The string 20 thus comprises a number N of filter pockets 2 adapted to the filter media support 10 and to the requirements, facilitating the storage, handling and placement of the filter media 1.

[0044] Figure 5 illustrates another form of filter bag 2', in the shape of a tetrahedron 7, closed to delimit a closed internal volume suitable for containing a filtration substrate. In this case, one of the vertices 8 has a ring 9 or a loop for attaching to the hook 14 provided in the support 10, or any other suitable fastening means. The filter bag shapes 2, 2' illustrated are not given by way of example only and are not limiting; the essential point is to provide a sufficient exchange surface with the water to be treated.

[0045] The filter media 1 can be used in combination with the specific support 10 described with reference to Figures 1 to 3, which is used with the filtration unit 100 described with reference to [Fig.1] or with any other compatible filtration unit.

[0046] However, the filter medium 1 of the invention can be used alone, i.e., without the support 10. In this case, the filter bags 2 connected in a chain 20 according to [Fig. 6], or used individually, can be placed directly in the upper part of a sand filter (not shown), in the basket of a skimmer (not shown), or even hung inside a filter sock (not shown) such as that described in the Applicant's publication FR 2 830 461 B1, without these examples being limiting. If the filter bags 2 The 20 filter bags are connected in a chain, making their installation in these various filtration systems and their replacement easier. Furthermore, the fact that the 2 filter bags are connected in a chain of 20 prevents them from mixing with the sand during backwashing of the sand filter to clean and regenerate it.

[0047] All or some of the filter bags 2, 2' are preferably filled with activated carbon, the other bags being able to contain one or more other molecular-type filtration substrates, such as those listed below. The carbon is preferably of plant origin and chemically activated to increase its porosity and / or to graft a specific surface chemistry, thereby increasing its specific surface area and adsorption capacity. Carbon derived from coconut shells offers excellent absorption capacities due to its microporous structure. It can be in the form of granules or particles with a particle size, for example, between 0.5 and 5 mm, without these values ​​being limiting. The activated carbon allows, in particular, the trapping of cyanuric acid molecules,

[0048] All or part of the filter bags 2 may contain other adsorbent filtration substrates and / or substrates that release one or more specific molecules, such as zeolites to remove certain heavy metals, silver grains to impart a biocidal effect to the filtration unit, clay beads to purify the water, or phosphate-removing resin grains to trap phosphates and thus reduce algae growth, without this list being exhaustive. Thus, it is very easy to combine different substrates in the same filter media support 10, making it possible to cover a very broad spectrum of target molecules.

[0049] The filter bags 2 must meet strict specifications. They must be porous and / or permeable to allow the water to be treated to pass through them and promote contact between the water and the filtration substrate they contain. If they are porous, the average pore diameter must be smaller than the minimum size of the activated carbon fines (on the order of micrometers) to limit or even prevent the escape of fine particles of the filter substrate eroded by water abrasion. They must also be resistant in all three dimensions to ensure durability, and at least for the recommended service life of the consumable. We will choose a fabric, canvas, tablecloth, felt or film, offering an air permeability at 125Pa of approximately 750 l / m2s, the air permeability at 125Pa being able to vary between 5001 / m2s and 10001 / m2s, without these values ​​being limiting.

[0050] This fabric may be a non-woven, non-woven, woven, knitted, braided textile product, a combination of these techniques, or any other equivalent technique. It may be obtained from fibers, filaments and / or yarns, in any material compatible with the specifications and capable of being assembled by sewing and / or welding, such as that a natural, artificial, or synthetic material. A synthetic material, preferably recyclable, such as polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), or a combination of these materials, is preferable, as it has the advantage of being heat-sealable. The fabric of the filter bags 2 can also be an extruded and micro-perforated synthetic film, or similar.

[0051] The making of the filter pockets 2 can use various known manufacturing processes, such as sewing, ultrasonic or pulse heat welding, thermoforming, or any other process compatible with the material of the fabric used, the main thing being to avoid glue which could degrade on contact with water, and to mechanically resist water abrasion.

[0052] The filter bags 2, 2' thus constitute a consumable product, that is to say, a product with a defined lifespan that must be replaced regularly to guarantee its functionality and effectiveness. After use, the filter bags can be discarded or, preferably, composted, or regenerated depending on the filtration substrate they contain. They are designed to generate little or no waste.

[0053] The particulate filtration stage 108 illustrated in [Fig. 1] comprises a hollow central core 111 which partially defines the central conduit 110 to allow the passage of water in the return flow direction. It also comprises a textile filter 112 of a known type, arranged to provide particulate filtration, and disposed around the central core 111. It may comprise any other known type of filter fulfilling the same function, such as a foam, a bag, a combination of different types of filters, etc. The textile filter 112 has pleats, in a known manner, to create an accordion-like structure or any other geometry that provides a large filtration surface area to capture and trap solid particles carried by the water to be treated.

[0054] The particulate textile filter 112 may consist of a non-woven or non-woven filter sheet made from heat-bonded polyester (PES) fibers. The filter sheet may be made from fibers, filaments, and / or yarns of various compatible materials, such as polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), or similar materials. The assembly of the fibers, filaments, and / or yarns may also be different and compatible, in particular by weaving, knitting, and / or braiding to replace heat bonding.

[0055] The particulate filtration stage 108 further includes drainage ports 113 in the upper part of the central core 111 for the passage of water, and a handle 114 for forming an interchangeable cartridge. However, any other particulate filtration system may be suitable.

[0056] The operation of the filtration unit 100 is illustrated in [Fig. 1]. The water to be treated contained in a basin (not shown) enters the tank 101 through the inlet port. 105 is provided in the lower part, then in the lower filtration stage 107 through the lower flange 11 of the support 10. The water then flows through the filter bags 2 which provide molecular filtration thanks to the absorbent properties of activated carbon and / or other molecular filtration substrates.

[0057] Cyanuric acid molecules, as well as all other undesirable contaminants (phosphates, nitrates, THMs, chloroform, heavy metals, etc.) carried by the water to be treated, are trapped by the activated carbon and / or other molecular filtration substrates (phosphate removers, etc.). The trapping of the target molecule(s) occurs when they pass in close proximity to the substrate, allowing a physicochemical interaction to take place. In particular, the retention of the stabilizer (cyanuric acid) occurs progressively with each repeated passage of water through the filter bags 2. Therefore, there is no risk of destabilizing the pool water, since the activated carbon will only remove excess stabilizer.

[0058] Continuing its forced circulation imposed by the filtration system pump, the water treated at the molecular level enters the upper filtration stage 108 through the upper flange 12 of the support 10. The water then circulates through the filter medium 112 which provides particulate filtration, removing from the water solid particles typically present in a swimming pool (sand, insects, plant matter, microalgae, etc.) but also grains of molecular filtration substrate in the event of accidental rupture of a filter bag 2. Continuing its forced circulation imposed by the filtration system pump, the water treated at the molecular and particulate levels enters the central conduit 110 through the discharge ports 113 in the upper part of the central core 111 and returns to the pool through the outlet port 106 in the lower part of the tank 101.

[0059] In the event of clogging of the molecular filtration stage 107, the vacuum generated by the filtration system pump causes the peripheral seal 15 to partially open. This seal, acting as a regulating valve, opens the passage between the two filtration stages 107 and 108, allowing water to circulate to the particulate filtration stage 108 and restoring the nominal flow rate set by the pump. Thus, particulate filtration and water circulation in the pool remain ensured.

[0060] If, at the molecular filtration stage 107, activated carbon particles were to pass through the barrier of the filter bags 2, particularly in the event of an accidental rupture of a bag, then they could be captured and trapped by the particulate filtration stage 108.

[0061] The present invention is of course not limited to the embodiments described but extends to any modification and variant obvious to a person skilled in the art within the limits of the appended claims. Furthermore, the characteristics The techniques of the different modes of embodiment and variants mentioned above can be, in whole or in part, combined with each other.

Claims

Demands

1. A molecular-type filter media (1) for a water filtration unit (100) in a basin, particularly a swimming pool, comprising at least one permeable, flexible, closed filter bag (2, 2') to delimit a closed internal volume, containing at least one solid filtration substrate arranged to trap molecular contaminants transported by the water to be treated, said filter bag (2, 2') constituting a consumable, and having the shape of a cylindrical tube (3) closed at its two flattened ends (5), characterized in that said filter bag (2, 2') comprises means for attachment (4) to a support, said attachment means being disposed at the two ends (5, 8) of said bag, and in that said filter bag (2, 2') is made of a textile product having an air permeability at 125 Pa between 5001 / m²s and 10001 / m2s.

2. Filter media according to claim 1, characterized in that said at least one filtration substrate is selected from the group comprising activated carbon granules, zeolites, clay beads, anti-phosphate resin grains, silver grains, arranged to trap contaminants selected from the group comprising cyanuric acid, phosphates, nitrates, THMs, chloroform, heavy metals.

3. Filtering medium according to claim 2, characterized in that said activated carbon is carbon derived from coconut shells.

4. Filtering media according to claim 1, characterized in that said filter pocket (2, 2') is made of a non-woven, non-woven, woven, knitted and / or braided textile product, from yarns, filaments and / or fibers of a preferably recyclable synthetic material, chosen from the group comprising polypropylenes (PP), polyethylene terephthalates (PET), polyethylenes (PE), or a combination of these materials.

5. Filtering media according to any one of claims 1 to 4, characterized in that it comprises a number N of filtering pockets (2, 2'), said filtering pockets containing the same filtration substrate or at least two different filtration substrates.

6. Filtering media according to claim 5, characterized in that the N filtering pockets (2, 2') are linked together by a link (6) to form a string (20).

7. Filter media support (10) for a water filtration unit (100) in a basin, in particular a swimming pool, characterized in that it comprises a filter media (1) according to any one of claims 1 to 6 and receiving means (14) cooperating with the fixing means (4) of said filter media to position and hold said filter media (1) by its two ends, and allow its assembly and disassembly from said support.

8. Filter media support according to claim 7, characterized in that it comprises a reel including two parallel flanges (11, 12) and a central tube (13) connecting the two flanges, each of said flanges (11, 12) including said receiving means (14) for said filter media (1).

9. Filter media support according to any one of claims 7 and 8, characterized in that the receiving means (14) of said support (10) comprise at least one hook cooperating with at least one corresponding orifice (4) provided in said filter media (1).

10. Filter media support according to claim 8, characterized in that said filter media (1) comprises N filter pockets (2, 2'), and in that the N filter pockets (2, 2') are arranged around the central tube (13) of said support, extend parallel to said central tube (13), and are attached to the two flanges (11, 12) of said support.

11. Filter media support according to claim 8, characterized in that at least one of said flanges (12) has a peripheral seal (15) arranged to form a regulating valve.

12. Water filtration unit (100) in a basin, in particular a swimming pool, said filtration unit comprising a tank (101) provided with at least one inlet port (105) and an outlet port (106) to allow circulation of the water to be treated, said tank comprising at least one molecular filtration stage (107), characterized in that said molecular filtration stage (107) comprises at least one filter media support (10) according to any one of claims 7 to 11.

13. A filtration unit according to claim 12, wherein said tank (101) comprises at least two superimposed filtration stages, including a molecular filtration stage (107) and a particulate filtration stage (108), characterized in that said molecular filtration stage (107) is located downstream of said particulate filtration stage (108), and in that the two filtration stages are separated from each other by the peripheral seal (15) forming a regulating valve, provided on one of the flanges (12) of said support (10).

14. Filtration unit according to claim 13, characterized in that it is designed in a modular manner, the ratio between the height of the molecular filtration stage (107) and the height of the particulate filtration stage (108) being adjustable and determined according to the filtration requirements.

15. Use of the filter media (1) according to any one of claims 1 to 6, placed directly in the upper part of a sand filter and / or in the basket of a skimmer and / or hooked inside a filter sock.

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