Fish tank filtering device with no-clean and zero-water-change functions
By using filter bags and nitrifying filter media to decompose fish waste in the aquarium filtration system and utilizing plant roots to absorb nitrates, the problem of regular aquarium cleaning is solved, achieving a filtration effect that requires no cleaning and no water changes, and maintaining stable water quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIHAI YIMU SHRIMP AGRICULTURAL TECHNOLOGY CO LTD
- Filing Date
- 2026-01-21
- Publication Date
- 2026-05-19
AI Technical Summary
Existing aquarium and fish pond filtration systems require regular cleaning, which leads to increased labor costs and disrupts the balance of microorganisms, potentially causing fish to get sick.
The aquarium uses a filter device that requires no cleaning and requires no water changes. The filter bag and nitrifying filter media in the filter box decompose fish waste, aerobic bacteria and nitrifying bacteria convert organic matter into inorganic salts, and plant roots absorb nitrates, thus achieving water recycling.
It achieves a filtration function that requires no cleaning or water changes, completely solving the problem of fish waste decomposition and treatment, maintaining stable water quality, and avoiding the risk of fish getting sick.
Smart Images

Figure CN122056249A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of aquarium filtration devices, specifically, it relates to an aquarium filtration device with the functions of no cleaning and zero water change. Background Technology
[0002] In current aquarium and fishpond filtration systems, regular cleaning is essential.
[0003] Specifically, the filter cotton and all filter media in the aquarium need to be removed, cleaned, and then put back in for reuse. This process is not only dirty and smelly but also labor-intensive. In addition, the cleaning process can disrupt the original biological system, interfere with the balance of microorganisms, and may cause fish to get sick due to stress from fish feces. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an aquarium filtration device that can overcome or at least partially solve the above problems.
[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is: a fish tank filter device with no cleaning and zero water change function, including a fish tank shell, wherein the fish tank shell has a partition for dividing the fish tank shell into a first chamber and a second chamber, and a maintenance cover is detachably installed on the second chamber, and further includes: A filter box is installed in chamber two, and the filter box is used to filter the water in chamber one; A plant cultivation filter trough is installed inside chamber one, and an ultraviolet lamp is installed inside the plant cultivation filter trough; The dual-purpose pump is installed in chamber two. The dual-purpose pump is used to draw in the liquid in chamber one and then filter it through the filter box. The filtered liquid will be discharged into the plant planting filter tank and chamber one.
[0006] In order to treat the fish feces in the filter bag, the filter box is further equipped with filter bags and nitrifying filter media; The filter bag is responsible for intercepting fish feces and keeping them inside the bag. With the help of bacterial fermentation and decomposition, the fish feces are converted into water, carbon dioxide, ammonia nitrogen and nitrite. The water, ammonia nitrogen and nitrite are squeezed out of the filter bag under the pressure of the water flow from the dual-purpose pump. When water carrying ammonia nitrogen and nitrite flows through the surface of nitrifying filter media, nitrifying bacteria attached to the surface of the filter media will decompose it and convert it into nitrate. Nitrate continues to be squeezed out of the filter box by the water pressure. A portion of the water is sent back into chamber one, while another small portion is transported to the plant planting filter at the top of the aquarium. The nitrate is then absorbed by the plant roots, and the water flows back into chamber one, thus achieving water recycling.
[0007] To further assist in the treatment of fish waste, the filter box is equipped with rotating component one and rotating component two. Rotating component one and rotating component two are respectively connected to the opening and bottom of the filter bag. Both rotating component one and rotating component two are used to rotate the filter bag. By rotating rotating component one and rotating component two, the fish waste inside the filter bag can be rotated, avoiding long-term accumulation. This not only prevents the filter holes at the bottom of the filter bag from becoming clogged, but also facilitates the decomposition of fish waste by bacteria.
[0008] Furthermore, the rotating assembly includes a magnetic ring, a gear ring, a servo motor, and a gear. The magnetic ring is installed inside the opening of the filter bag, and the gear ring is fitted onto the opening of the filter bag. The gear ring and the magnetic ring are magnetically connected to fix the opening of the filter bag. The gear is fixedly connected to the output end of the servo motor and meshes with the gear ring. The servo motor is fixedly connected inside the filter box. The rotation of the output end of the servo motor causes the opening of the filter bag to rotate.
[0009] Furthermore, the rotating assembly two includes a magnetic ring two, a gear ring two, a servo motor two, and a gear two. The magnetic ring two is installed at the bottom of the filter bag, and the gear ring two is sleeved on the outside of the bottom of the filter bag. The gear ring two is magnetically connected to the magnetic ring two, and the bottom of the filter bag is fixed by magnetic attraction. The gear two is fixedly connected to the output end of the servo motor two, and the gear two is meshed with the gear ring two. The servo motor two is installed inside the filter box, and the bottom of the filter bag can be rotated by the rotation of the output end of the servo motor two.
[0010] To facilitate the shaking off fish feces adhering to the filter bag, a telescopic cylinder is fixedly connected inside the filter box, and the servo motor is fixedly connected to the telescopic end of the telescopic cylinder.
[0011] To facilitate stable movement, multiple sets of limiting blocks are fixedly connected to the inner wall of the filter box, a limiting ring is fixedly connected to the toothed ring two, a limiting rod is slidably connected to the limiting ring, and the other end of the limiting rod is slidably connected to the limiting block. The limiting rod, limiting block, and limiting ring are used for the stable lateral movement of the rotating assembly two.
[0012] To prevent unfiltered water from being discharged directly, a mounting bracket is fixedly connected inside the filter box. A plastic flexible plate is detachably mounted on the mounting bracket. A round hole is opened in the middle area of the plastic flexible plate. The toothed ring fits into the round hole. The plastic flexible plate acts as a blockage to prevent unfiltered water from being discharged directly.
[0013] To facilitate subsequent maintenance, the filter box is further equipped with a connecting pipe and a first outlet pipe, respectively, with the inlet and outlet pipes detachably installed. The other end of the connecting pipe is connected to a dual-purpose pump. A second outlet pipe is branched onto the first outlet pipe. The outlet end of the first outlet pipe is located inside the plant planting filter trough, and the outlet end of the second outlet pipe is connected to the first chamber.
[0014] Furthermore, the inlet end of the dual-purpose pump is connected to an inlet pipe, which is connected to a chamber.
[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention realizes the function of zero water change and cleaning-free filtration. Its key lies in completely solving the problem of decomposition and treatment of organic matter (such as fish feces). Organic matter and fish feces are decomposed into water and carbon dioxide by aerobic bacteria in the filter bag, realizing the complete decomposition of organic matter and its conversion into inorganic salts. Meanwhile, inorganic nitrites are converted into non-toxic nitrates by nitrifying bacteria, and the nitrates are absorbed by plant roots as nutrients. This technical solution effectively solves the problem of nitrite treatment through this cyclical system. Attached Figure Description
[0016] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of a fish tank filter device with cleaning-free and zero-water-change functions proposed in this invention. Figure 2 This is a schematic cross-sectional view of a fish tank filter device with no cleaning and zero water change functions proposed in this invention. Figure 1 ; Figure 3 This is a schematic cross-sectional view of a fish tank filter device with no cleaning and zero water change functions proposed in this invention. Figure 2 ; Figure 4 This is a front sectional view of the filter box in a fish tank filtration device with no cleaning and zero water change functions proposed in this invention. Figure 1 ; Figure 5 This invention proposes a fish tank filtration device with no cleaning and zero water change functions. Figure 4 A schematic diagram of the structure of part A; Figure 6This invention proposes a fish tank filtration device with no cleaning and zero water change functions. Figure 4 A structural diagram of section B; Figure 7 This invention proposes a fish tank filtration device with no cleaning and zero water change functions. Figure 4 A structural diagram of section C; Figure 8 This is a front sectional view of the filter box in a fish tank filtration device with no cleaning and zero water change functions proposed in this invention. Figure 2 ; Figure 9 This is a side sectional view of the filter box in a fish tank filtration device with no cleaning and zero water change functions proposed in this invention.
[0017] In the diagram: 1. Aquarium shell; 101. Chamber 1; 102. Chamber 2; 103. Inspection cover; 2. Planting filter tray; 3. Ultraviolet lamp; 4. Filter box; 401. Mounting bracket; 402. Plastic flexible board; 4031. Limiting rod; 4032. Limiting block; 404. Nitrification filter media; 501. Dual-purpose pump; 502. Inlet pipe; 503. Outlet pipe 1; 504. Outlet pipe 2; 6011. Magnetic ring 1; 6012. Gear ring 1; 6021. Magnetic ring 2; 6022. Gear ring 2; 7011. Servo motor 1; 7012. Gear 1; 7021. Servo motor 2; 7022. Gear ring 2; 8. Telescopic cylinder; 9. Filter bag. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0019] Example: Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 A fish tank filter device with no cleaning and zero water change functions includes a fish tank shell 1, a partition inside the fish tank shell 1 for dividing the fish tank shell 1 into a first chamber 101 and a second chamber 102, a maintenance cover 103 detachably installed on the second chamber 102, and further includes: Filter box 4 is installed in chamber 2 102. Filter box 4 is used to filter the water in chamber 1 101. Planting filter trough 2 is installed in chamber 101, and ultraviolet lamp 3 is installed in planting filter trough 2. The dual-purpose pump 501 is installed in the second chamber 102. The dual-purpose pump 501 is used to draw in the liquid in the first chamber 101 and then filter it through the filter box 4. The filtered liquid will be discharged into the plant planting filter tank 2 and the first chamber 101.
[0020] The filter box 4 contains a filter bag 9 and nitrification filter media 404. The filter bag 9 has a hollow cylindrical structure. Its open end is magnetically fixed to the toothed ring 6012 via magnetic ring 6011, and its bottom is magnetically fixed to the toothed ring 6022 via magnetic ring 6021. After the dual-purpose pump 501 pumps the water from chamber 101 into the filter bag 9, the filter bag 9 intercepts fish feces in the water and retains them inside the bag. The aerobic bacteria pre-attached inside the bag ferment and decompose the fish feces, producing water, carbon dioxide, ammonia nitrogen, and nitrite. These products are squeezed out of the filter bag 9 under the water pressure of the dual-purpose pump 501. Nitrifying filter media 404: When water carrying ammonia nitrogen and nitrite flows through the surface of the nitrifying filter media, nitrifying bacteria attached to the surface of the filter media will decompose it and convert it into nitrate. Nitrate continues to be squeezed out of the filter box 4 by the water pressure. A portion of the water is sent back into the chamber 101, while another small portion is transported to the plant planting filter 2 at the top of the aquarium. The nitrate is then absorbed by the plant roots, and the water flows back into the chamber 101, thus achieving water recycling.
[0021] The main body of the aquarium filter device in this embodiment is an aquarium shell 1, which is divided into two functional areas by a partition: a chamber 101 for raising fish and a chamber 2 102 for installing filter components; a maintenance cover 103 can be detachably installed on the top of the chamber 2 102 for easy maintenance of the components later.
[0022] The first chamber 101 contains a fixed plant planting filter tank 2, with a 25W ultraviolet lamp 3 embedded in the tank to inhibit harmful microorganisms (such as pathogens and algal spores) in the return water. The second chamber 102 contains a dual-purpose pump 501 and a filter box 4. The inlet end of the dual-purpose pump 501 is connected to the first chamber 101 through the inlet pipe 502 to extract the water to be filtered in the first chamber 101.
[0023] Specifically, such as Figure 5 , Figure 6 , Figure 7 As shown, rotating component one and rotating component two are installed inside the filter box 4. Rotating component one and rotating component two are respectively connected to the opening and bottom of the filter bag 9. Rotating component one and rotating component two are used to rotate the filter bag 9. By rotating rotating component one and rotating component two, the fish feces inside the filter bag 9 can be rotated, avoiding long-term accumulation. This not only prevents the filter holes at the bottom of the filter bag 9 from becoming clogged, but also facilitates the decomposition of fish feces by bacteria.
[0024] The rotating assembly includes a magnetic ring 6011, a gear ring 6012, a servo motor 7011, and a gear 7012. The magnetic ring 6011 is installed inside the opening of the filter bag 9, and the gear ring 6012 is fitted onto the opening of the filter bag 9. The gear ring 6012 is magnetically connected to the magnetic ring 6011, and the opening of the filter bag 9 is fixed by magnetic attraction. The gear 7012 is fixedly connected to the output end of the servo motor 7011, and the gear 7012 is meshed with the gear ring 6012. The servo motor 7011 is fixedly connected inside the filter box 4. The opening of the filter bag 9 can be rotated by the rotation of the output end of the servo motor 7011.
[0025] Servo motor 7011 is fixed to the inner wall of filter box 4, and gear 7012 is installed at its output end. Gear 7012 meshes with gear ring 6012. Gear 7012 has retaining rings on both sides, which are adapted to the tooth grooves of gear ring 6012 to ensure that gear ring 6012 rotates synchronously with gear 7012 without radial offset.
[0026] The rotating assembly two includes a magnetic ring two 6021, a toothed ring two 6022, a servo motor two 7021, and a gear two 7022. The magnetic ring two 6021 is installed at the bottom of the filter bag 9, and the toothed ring two 6022 is sleeved on the outside of the bottom of the filter bag 9. The toothed ring two 6022 is magnetically connected to the magnetic ring two 6021, and the bottom of the filter bag 9 is fixed by magnetic attraction. The gear two 7022 is fixedly connected to the output end of the servo motor two 7021, and the gear two 7022 is meshed with the toothed ring two 6022. The servo motor two 7021 is installed in the filter box 4. The bottom of the filter bag 9 can be rotated by the rotation of the output end of the servo motor two 7021.
[0027] Servo motor 2 7021 is fixed to the telescopic end of telescopic cylinder 8, and gear 2 7022 is installed at its output end. Gear 2 7022 meshes with gear ring 2 6022. Gear 2 7022 is also provided with retaining rings on both sides to engage with the tooth grooves of gear ring 2 6022. At the same time, the limiting ring on gear ring 2 6022 is slidably connected to the limiting block 4032 on the inner wall of filter box 4 through limiting rod 4031, providing guidance for the lateral movement of rotating component 2.
[0028] Furthermore, such as Figure 8 As shown, a telescopic cylinder 8 is fixedly connected inside the filter box 4, and a servo motor 7021 is fixedly connected to the telescopic end of the telescopic cylinder 8.
[0029] like Figure 8 , Figure 9As shown, multiple sets of limiting blocks 4032 are fixedly connected to the inner wall of the filter box 4. A limiting ring is fixedly connected to the toothed ring 6022. A limiting rod 4031 is slidably connected to the limiting ring. The other end of the limiting rod 4031 is slidably connected to the limiting block 4032. The limiting rod 4031, the limiting block 4032, and the limiting ring are used for the stable lateral movement of the rotating component 2.
[0030] A mounting bracket 401 is fixedly connected inside the filter box 4. A plastic flexible plate 402 is detachably mounted on the mounting bracket 401. A round hole is opened in the middle area of the plastic flexible plate 402. The toothed ring 6012 fits into the round hole. The plastic flexible plate 402 plays a blocking role to prevent water from being discharged directly without filtration.
[0031] A plastic flexible plate 402 can be detachably installed on the mounting bracket 401 inside the filter box 4. The round hole in the middle of the flexible plate fits with the toothed ring 6022, which can seal the liquid inlet side area of the filter box 4, ensuring that the water must be filtered by the filter bag 9 before entering the nitrification filter media 404 area, thus preventing unfiltered water from being discharged directly.
[0032] The filter box 4 has a detachable connecting pipe and a first outlet pipe 503 installed at its inlet and outlet ends, respectively. The other end of the connecting pipe is connected to the dual-purpose pump 501. A second outlet pipe 504 is branched onto the first outlet pipe 503. The outlet end of the first outlet pipe 503 is located inside the plant planting filter tank 2, and the outlet end of the second outlet pipe 504 is connected to the first chamber 101.
[0033] The inlet end of the dual-purpose pump 501 is connected to an inlet pipe 502, which is connected to chamber 101.
[0034] It also includes a control system, which is electrically connected to the dual-purpose pump 501, servo motor 1 7011, servo motor 2 7021, and telescopic cylinder (8) to control the operating status of each component.
[0035] Specifically, in daily use of this device: When the telescopic cylinder 8 is in the extended state, the filter bag 9 maintains a natural and loose cylindrical shape; the control system controls servo motor 1 7011 and servo motor 2 7021 to rotate at the same speed of 20r / min, driving the filter bag 9 to rotate as a whole, so that fish feces are evenly distributed along the inner wall of the filter bag 9, avoiding local blockage, while strengthening the water flow disturbance inside the bag and improving the decomposition efficiency of aerobic bacteria.
[0036] The subsequent step is a periodic tightening and cleaning mode: The control system has a preset cleaning program that runs every 2-3 days. The process is as follows: When the telescopic cylinder 8 retracts, it drives the rotating component 2 to move quickly laterally towards the rotating component 1. The filter bag 9 quickly switches from a loose state to a taut state. During this process, the tension generated by the filter bag 9 wall will break the fish feces clumps that are tightly attached to the bag surface, causing them to detach from the bag wall and suspend in the water flow inside the bag. This process will not be excessively stretched, causing the filter bag 9 to break. Subsequently, servo motor 1 (7011) rotates at 30 r / min, and servo motor 2 (7021) rotates asynchronously at 45 r / min. The retaining rings on both sides of the gear drive gear ring 1 (6012) and gear ring 2 (6022) to generate an angular difference, causing the taut filter bag 9 to undergo dynamic twisting and stretching motion, further shaking off stubborn impurities in the pores (not limited to this speed, but can be rotated faster by rotating component 1 and slower by rotating component 2). After cleaning, servo motor 1 (7011) and servo motor 2 (7021) rotate in reverse to reset, telescopic cylinder 8 extends, filter bag 9 returns to a loose cylindrical state, and switches back to the daily synchronous rotation mode.
[0037] For subsequent maintenance, simply remove the inspection cover 103 to maintain the filter box 4.
[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A fish tank filter device with no cleaning and zero water change function, comprising a fish tank shell (1), wherein the fish tank shell (1) has a partition for dividing the fish tank shell (1) into a first chamber (101) and a second chamber (102), wherein a maintenance cover (103) is detachably installed on the second chamber (102), characterized in that, Also includes: A filter box (4) is installed in chamber two (102), and the filter box (4) is used to filter the water in chamber one (101); A plant cultivation filter tank (2) is installed in chamber 1 (101), and an ultraviolet lamp (3) is installed in the plant cultivation filter tank (2). The dual-purpose pump (501) is installed in the second chamber (102). The dual-purpose pump (501) is used to draw in the liquid in the first chamber (101) and then filter it through the filter box (4). The filtered liquid will be discharged into the plant planting filter tank (2) and the first chamber (101).
2. The aquarium filter device with self-cleaning and zero-water-change functions according to claim 1, characterized in that, The filter box (4) is equipped with a filter bag (9) and a nitrification filter material (404). The filter bag (9) is responsible for intercepting fish feces and keeping them inside the bag. With the help of bacterial fermentation and decomposition, the fish feces are converted into water, carbon dioxide, ammonia nitrogen and nitrite. The water, ammonia nitrogen and nitrite are squeezed out of the filter bag (9) under the water pressure of the dual-purpose pump (501). When water carrying ammonia nitrogen and nitrite flows through the surface of the nitrifying filter media (404), the nitrifying bacteria attached to the surface of the filter media will decompose it and convert it into nitrate. Nitrate continues to be squeezed out of the filter box (4) by the water pressure. A portion of the water is sent back into the chamber (101), while another small portion of the water is transported to the plant planting filter tank (2) at the top of the aquarium. The nitrate is then absorbed by the plant roots, and the water flows back into the chamber (101), thus achieving water recycling.
3. The aquarium filter device with self-cleaning and zero-water-change functions according to claim 2, characterized in that, The filter box (4) is equipped with rotating component one and rotating component two. Rotating component one and rotating component two are respectively connected to the opening and bottom of the filter bag (9). Rotating component one and rotating component two are used to rotate the filter bag (9). By rotating component one and rotating component two, the fish feces in the filter bag (9) can be rotated, avoiding long-term accumulation. While avoiding blockage of the filter holes at the bottom of the filter bag (9), it also facilitates the decomposition of fish feces by bacteria.
4. The aquarium filter device with self-cleaning and zero-water-change functions according to claim 3, characterized in that, The rotating assembly includes a magnetic ring (6011), a gear ring (6012), a servo motor (7011), and a gear (7012). The magnetic ring (6011) is installed inside the opening of the filter bag (9). The gear ring (6012) is fitted onto the opening of the filter bag (9). The gear ring (6012) is magnetically connected to the magnetic ring (6011) to fix the opening of the filter bag (9) through magnetic attraction. The gear (7012) is fixedly connected to the output end of the servo motor (7011). The gear (7012) is meshed with the gear ring (6012). The servo motor (7011) is fixedly connected inside the filter box (4). The opening of the filter bag (9) can be rotated by the rotation of the output end of the servo motor (7011).
5. A fish tank filter device with self-cleaning and zero-water-change functions according to claim 4, characterized in that, The rotating component two includes a magnetic ring two (6021), a toothed ring two (6022), a servo motor two (7021), and a gear two (7022). The magnetic ring two (6021) is installed at the bottom of the filter bag (9). The toothed ring two (6022) is sleeved on the bottom of the filter bag (9). The toothed ring two (6022) is magnetically connected to the magnetic ring two (6021) to fix the bottom of the filter bag (9) through magnetic attraction. The gear two (7022) is fixedly connected to the output end of the servo motor two (7021). The gear two (7022) is meshed with the toothed ring two (6022). The servo motor two (7021) is installed in the filter box (4). The bottom of the filter bag (9) can be rotated by the rotation of the output end of the servo motor two (7021).
6. A fish tank filter device with self-cleaning and zero-water-change functions according to claim 5, characterized in that, The filter box (4) is fixedly connected to a telescopic cylinder (8), and the servo motor (7021) is fixedly connected to the telescopic end of the telescopic cylinder (8).
7. A fish tank filter device with self-cleaning and zero-water-change functions according to claim 6, characterized in that, Multiple sets of limiting blocks (4032) are fixedly connected to the inner wall of the filter box (4). A limiting ring is fixedly connected to the toothed ring (6022). A limiting rod (4031) is slidably connected to the limiting ring. The other end of the limiting rod (4031) is slidably connected to the limiting block (4032). The limiting rod (4031), the limiting block (4032), and the limiting ring are used for the stable lateral movement of the rotating component two.
8. A fish tank filter device with self-cleaning and zero-water-change functions according to claim 5, characterized in that, The filter box (4) is fixedly connected to the mounting bracket (401), and a plastic soft plate (402) is detachably installed on the mounting bracket (401). A round hole is opened in the middle area of the plastic soft plate (402), and the toothed ring (6012) fits into the round hole. The plastic soft plate (402) plays a blocking role to prevent water from being discharged directly without filtration.
9. A fish tank filter device with self-cleaning and zero-water-change functions according to claim 1, characterized in that, The filter box (4) is detachably equipped with a connecting pipe and a first outlet pipe (503) at its inlet and outlet ends. The other end of the connecting pipe is connected to a dual-purpose pump (501). A second outlet pipe (504) is branched onto the first outlet pipe (503). The outlet end of the first outlet pipe (503) is located inside the plant planting filter tank (2). The outlet end of the second outlet pipe (504) is connected to the first chamber (101).
10. A fish tank filter device with self-cleaning and zero-water-change functions according to claim 9, characterized in that, The inlet end of the dual-purpose pump (501) is connected to an inlet pipe (502), which is connected to chamber one (101).