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Best Small Fish Tank Filter 20l of 2026
Last updated on 03/04/2026
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1
OsAtNb Quiet Fish Tank Filter 4-in-1 Internal Aquarium Filter for 20L-200L Submersible Water Pump Oxygen Aeration Wave Maker Water Change for Betta, Turtle, Pond Fish, Garden(S)
OsAtNb
17% Off
Why we love it
Versatile with wide applications.
Multi-function with free switching.
Effectively filters waste.
Main Highlights
【 Wide application】 This Ultra quiet designed filter water pump fits 20L-180L tank,has a wide range of applications that it can be used in aquariums, ecological tanks, breeding ponds, landscape tubes, gardens, rockery fountains, Waterfalls, Hydroponic systems, Irrigation systems etc.
【 Multi-function free switching 】: This filter come with 3 kinds of water outlet,you can switch increase oxygen and filtration, wave maker pump, water change and pump water function easily
【 Effecticent filteration designed 】 Increase filter box size and install 2 pieces Biochemical-sponge,which can effectively filter waste and improve the circulation system to maintain a clean water environment. easy to seperate and clean.
【 Product parameter 】Power: 6W, Maximal Flow Rate: 134GPH (500L/H), Maximal Lift height: up to 0.8M, Length of power cord:1.1M.
【 Submersible pump function 】: Ip68 Waterproof & Submersible,it can used as a submersible pump with diameter of 12mm outlet,compatible with most of the hose caliber.
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9.8
Exceptional
Check Price
9.8
Exceptional
OsAtNb
OsAtNb Quiet Fish Tank Filter 4-in-1 Internal Aquarium Filter for 20L-200L Submersible Water Pump Oxygen Aeration Wave Maker Water Change for Betta, Turtle, Pond Fish, Garden(S)
17% Off
Check Price
Show More
Why we love it
Versatile with wide applications.
Multi-function with free switching.
Effectively filters waste.
Main Highlights
【 Wide application】 This Ultra quiet designed filter water pump fits 20L-180L tank,has a wide range of applications that it can be used in aquariums, ecological tanks, breeding ponds, landscape tubes, gardens, rockery fountains, Waterfalls, Hydroponic systems, Irrigation systems etc.
【 Multi-function free switching 】: This filter come with 3 kinds of water outlet,you can switch increase oxygen and filtration, wave maker pump, water change and pump water function easily
【 Effecticent filteration designed 】 Increase filter box size and install 2 pieces Biochemical-sponge,which can effectively filter waste and improve the circulation system to maintain a clean water environment. easy to seperate and clean.
【 Product parameter 】Power: 6W, Maximal Flow Rate: 134GPH (500L/H), Maximal Lift height: up to 0.8M, Length of power cord:1.1M.
【 Submersible pump function 】: Ip68 Waterproof & Submersible,it can used as a submersible pump with diameter of 12mm outlet,compatible with most of the hose caliber.
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Value for Money
2
AQQA Aquarium Sponge Filter, Dual Sponge Ultra Quiet Fish Tank Filter with Multi-Stage Filtration, 360° Adjustable Outlet, 2 Bags of Ceramic Balls and 1 Bag of Ceramic Rings
AQQA
Why we love it
Crystal-clear water for aquariums.
Enhances oxygen for aquatic life.
Easy to install and clean.
Main Highlights
Triple-Stage Filtration: Biochemical cotton adsorbs debris, ceramic balls & rings purify and stabilise the water, ensuring crystal-clear and healthy aquarium environments for fish and plants
Dissolved Oxygen: Works seamlessly with air pumps (sold separately) to generate gentle water flow, while the included air stone quietly enhances oxygen levels and creates natural water circulation
Adjustable & Retractable Water Outlet: 360° rotating spout for customizing water flow direction and height (above or below water), ideal for controlling currents in shrimp tanks, betta tanks, or reef setups
Dual Bio-Sponge Design: Dual-sided sponges maximize mechanical filtration, reducing tank maintenance while supporting sensitive aquatic life in freshwater or marine tanks, It is recommended to clean the filter once every 2-3 weeks
Universal Compatibility: Compact, durable design fits 38-150L tanks; Suitable for saltwater and fresh water; Easy to install and clean, perfect for beginners and experts alike! No motor or electricity required (air pump needed)
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9.7
Exceptional
Check Price
9.7
Exceptional
AQQA
AQQA Aquarium Sponge Filter, Dual Sponge Ultra Quiet Fish Tank Filter with Multi-Stage Filtration, 360° Adjustable Outlet, 2 Bags of Ceramic Balls and 1 Bag of Ceramic Rings
Check Price
Show More
Why we love it
Crystal-clear water for aquariums.
Enhances oxygen for aquatic life.
Easy to install and clean.
Main Highlights
Triple-Stage Filtration: Biochemical cotton adsorbs debris, ceramic balls & rings purify and stabilise the water, ensuring crystal-clear and healthy aquarium environments for fish and plants
Dissolved Oxygen: Works seamlessly with air pumps (sold separately) to generate gentle water flow, while the included air stone quietly enhances oxygen levels and creates natural water circulation
Adjustable & Retractable Water Outlet: 360° rotating spout for customizing water flow direction and height (above or below water), ideal for controlling currents in shrimp tanks, betta tanks, or reef setups
Dual Bio-Sponge Design: Dual-sided sponges maximize mechanical filtration, reducing tank maintenance while supporting sensitive aquatic life in freshwater or marine tanks, It is recommended to clean the filter once every 2-3 weeks
Universal Compatibility: Compact, durable design fits 38-150L tanks; Suitable for saltwater and fresh water; Easy to install and clean, perfect for beginners and experts alike! No motor or electricity required (air pump needed)
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3
Interpet Internal Aquarium Fish Tank Filter, Bio CF1, Includes Coir Tech Bio Cartridges, High Flow Silent Filtration Cleans Water, for Coldwater & Tropical 36-68 Litres (Aquarium length up to 60cm)
Interpet
Why we love it
Whisper quiet filtration.
Crystal clear water.
Easy maintenance access.
Main Highlights
EFFORTLESS CARE, SPARKLING RESULTS - This filter boasts superior filtration with bio-degradable coir tech and easy monthly cartridge changes
5 STAGE FILTRATION FOR CRYSTAL CLEAR WATER - This powerhouse filter utilizes a 5-stage filtration system to keep your water sparkling clean and healthy
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9.6
Superb
Check Price
9.6
Superb
Interpet
Interpet Internal Aquarium Fish Tank Filter, Bio CF1, Includes Coir Tech Bio Cartridges, High Flow Silent Filtration Cleans Water, for Coldwater & Tropical 36-68 Litres (Aquarium length up to 60cm)
Check Price
Show More
Why we love it
Whisper quiet filtration.
Crystal clear water.
Easy maintenance access.
Main Highlights
EFFORTLESS CARE, SPARKLING RESULTS - This filter boasts superior filtration with bio-degradable coir tech and easy monthly cartridge changes
5 STAGE FILTRATION FOR CRYSTAL CLEAR WATER - This powerhouse filter utilizes a 5-stage filtration system to keep your water sparkling clean and healthy
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4
Interpet Internal Aquarium Fish Tank PF1 Power Filter, Cleans Water, for Coldwater & Tropical Aquariums Up to 68 Litre, black/blue
Interpet
32% Off
Why we love it
Four-stage filtration system.
Removes odours effectively.
Easy-to-use fixing bracket.
Main Highlights
Water filter for cleaner, healthier aquariums - four stage filtration with directional control and flow rate control
Removes particulate waste from the aquarium, removes odours and toxic chemicals
The good bacteria will thrive on the plain foams within the filter and break down the waste (excess fish food, plant matter, fish waste) to keep water clean and healthy for your fish
Comes with an easy to use fixing bracket. The bracket and suckers can be left in place while the filter is removed from the aquarium for cleaning
The powerful venturi aerates the water by increasing water circulation and thus the surface area. The venturi is adjusted by a simple rocker switch
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9.4
Superb
Check Price
9.4
Superb
Interpet
Interpet Internal Aquarium Fish Tank PF1 Power Filter, Cleans Water, for Coldwater & Tropical Aquariums Up to 68 Litre, black/blue
32% Off
Check Price
Show More
Why we love it
Four-stage filtration system.
Removes odours effectively.
Easy-to-use fixing bracket.
Main Highlights
Water filter for cleaner, healthier aquariums - four stage filtration with directional control and flow rate control
Removes particulate waste from the aquarium, removes odours and toxic chemicals
The good bacteria will thrive on the plain foams within the filter and break down the waste (excess fish food, plant matter, fish waste) to keep water clean and healthy for your fish
Comes with an easy to use fixing bracket. The bracket and suckers can be left in place while the filter is removed from the aquarium for cleaning
The powerful venturi aerates the water by increasing water circulation and thus the surface area. The venturi is adjusted by a simple rocker switch
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5
NICREW Fish Tank Filter, Internal Aquarium Filter for Small Tank, Coldwater or Tropical Aquariums, Up to 20L Black
NICREW
30% Off
Limited time deal
Why we love it
Ensures clear water and environment.
Versatile with multiple functions.
Quick assembly and secure installation.
Main Highlights
Optimal water filtration system for small aquariums that ensures proper oxygenation for clear water and a healthy environment
With the detachable spray bar, Nicrew aquarium filter also could work as a wave maker, fountain water pump and oxygen supply, helping agitate the water surface and improve aeration
Quickly assembles and disassembles and comes with five suction cups for secure in-tank installation
Perfect for odd-shaped or shallow habitats–can be mounted horizontally or vertically and can be fully submerged
Internal filter providing effective and thorough biological filtration. Comes complete with media and pipework
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9.2
Superb
Limited time deal
Check Price
9.2
Superb
NICREW
NICREW Fish Tank Filter, Internal Aquarium Filter for Small Tank, Coldwater or Tropical Aquariums, Up to 20L Black
30% Off
Limited time deal
Check Price
Show More
Why we love it
Ensures clear water and environment.
Versatile with multiple functions.
Quick assembly and secure installation.
Main Highlights
Optimal water filtration system for small aquariums that ensures proper oxygenation for clear water and a healthy environment
With the detachable spray bar, Nicrew aquarium filter also could work as a wave maker, fountain water pump and oxygen supply, helping agitate the water surface and improve aeration
Quickly assembles and disassembles and comes with five suction cups for secure in-tank installation
Perfect for odd-shaped or shallow habitats–can be mounted horizontally or vertically and can be fully submerged
Internal filter providing effective and thorough biological filtration. Comes complete with media and pipework
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6
NICREW Fish Tank Filter, Internal Aquarium Filter for Small Tank, Coldwater or Tropical Aquariums, 20-40L Black
NICREW
24% Off
Limited time deal
Why we love it
Versatile water aeration options.
Easy assembly and maintenance.
Flexible mounting orientations.
Main Highlights
Optimal water filtration system for small aquariums that ensures proper oxygenation for clear water and a healthy environment.
With the detachable spray bar, Nicrew aquarium filter also could work as a wave maker, fountain water pump and oxygen supply, helping agitate the water surface and improve aeration.
Perfect for odd-shaped or shallow habitats–can be mounted horizontally or vertically and can be fully submerged.
Quickly assembles and disassembles and comes with five suction cups for secure in-tank installation.
Internal filter providing mechanical and chemical filtering. Comes complete with media and pipework.
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9.0
Superb
Limited time deal
Check Price
9.0
Superb
NICREW
NICREW Fish Tank Filter, Internal Aquarium Filter for Small Tank, Coldwater or Tropical Aquariums, 20-40L Black
24% Off
Limited time deal
Check Price
Show More
Why we love it
Versatile water aeration options.
Easy assembly and maintenance.
Flexible mounting orientations.
Main Highlights
Optimal water filtration system for small aquariums that ensures proper oxygenation for clear water and a healthy environment.
With the detachable spray bar, Nicrew aquarium filter also could work as a wave maker, fountain water pump and oxygen supply, helping agitate the water surface and improve aeration.
Perfect for odd-shaped or shallow habitats–can be mounted horizontally or vertically and can be fully submerged.
Quickly assembles and disassembles and comes with five suction cups for secure in-tank installation.
Internal filter providing mechanical and chemical filtering. Comes complete with media and pipework.
Show More
7
PYPABL 3W Internal Aquarium Filter, Submersible Fish Tank Filter with 250 LPH Water Pump for Up to 35 Litres Small Fish Tanks, Quiet Filter with Rainwater Aerator System
PYPABL
Why we love it
Compact and energy-efficient design.
Multifunctional filtration and circulation.
Easy maintenance for long-lasting use.
Main Highlights
Compact Aquarium Internal Filter: Small size: 13.6*4*3.5cm/5.4*1.6*1.4in, power: 3W, H. Max: 90CM/3FT, water flow: 250L/H (66G/H), taking up less space and using less energy, ideal for 1-35 litres/1-10 gallons small fish tanks. With gentle water flow, this submersible filter is perfect for raising betta, guppy, zebra fish, molly, angel fish.
Filtration, Water Circulation and Oxygenation: This 3-in-1 multifunctional small fish tank filter can not only filter impurities in aquarium, but also add a certain amount of air bubbles to fish tank, and circulate water during operation. Additionally, the pump head can be used separately to enhance the water circulation in fish tank like installing near the heater to distribute heat.
Easy to Maintain: The side of this filter box is made of transparent plastic, and the yellow sponge is put inside, which makes this internal filter easy to observe whether the sponge needs to be cleaned. We recommend washing the sponge regularly like once a week with aquarium water and the sponge can use about 12-18 months generally.
Simple to Assemble & Disassemble: Come with 4 suction cups, very easy to firmly fix the filter on the tank and to cushion vibration during the operation of the filter. Simple structure, easy to separate the pump head and filter body and easy to remove the internal sponge to clean the rotor and sponge regularly.
Quiet Operation: This compact submersible fish tank filter runs quietly and smoothly, noise level<35dB. When in operation, 4 suction cups can cushion vibration and you can only hear the sound of water flow. You can also install the filter including its water outlet fully submersible in water to make wave.
Use a relatively coarse sponge, which allows water to pass through while filtering out impurities in the water. Of course, you can also add other kinds of filtering sponges or materials in the filter box to meet the needs of your fish tank. We provide 24 months after-sales service for this filter.
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8.8
Excellent
Check Price
8.8
Excellent
PYPABL
PYPABL 3W Internal Aquarium Filter, Submersible Fish Tank Filter with 250 LPH Water Pump for Up to 35 Litres Small Fish Tanks, Quiet Filter with Rainwater Aerator System
Check Price
Show More
Why we love it
Compact and energy-efficient design.
Multifunctional filtration and circulation.
Easy maintenance for long-lasting use.
Main Highlights
Compact Aquarium Internal Filter: Small size: 13.6*4*3.5cm/5.4*1.6*1.4in, power: 3W, H. Max: 90CM/3FT, water flow: 250L/H (66G/H), taking up less space and using less energy, ideal for 1-35 litres/1-10 gallons small fish tanks. With gentle water flow, this submersible filter is perfect for raising betta, guppy, zebra fish, molly, angel fish.
Filtration, Water Circulation and Oxygenation: This 3-in-1 multifunctional small fish tank filter can not only filter impurities in aquarium, but also add a certain amount of air bubbles to fish tank, and circulate water during operation. Additionally, the pump head can be used separately to enhance the water circulation in fish tank like installing near the heater to distribute heat.
Easy to Maintain: The side of this filter box is made of transparent plastic, and the yellow sponge is put inside, which makes this internal filter easy to observe whether the sponge needs to be cleaned. We recommend washing the sponge regularly like once a week with aquarium water and the sponge can use about 12-18 months generally.
Simple to Assemble & Disassemble: Come with 4 suction cups, very easy to firmly fix the filter on the tank and to cushion vibration during the operation of the filter. Simple structure, easy to separate the pump head and filter body and easy to remove the internal sponge to clean the rotor and sponge regularly.
Quiet Operation: This compact submersible fish tank filter runs quietly and smoothly, noise level<35dB. When in operation, 4 suction cups can cushion vibration and you can only hear the sound of water flow. You can also install the filter including its water outlet fully submersible in water to make wave.
Use a relatively coarse sponge, which allows water to pass through while filtering out impurities in the water. Of course, you can also add other kinds of filtering sponges or materials in the filter box to meet the needs of your fish tank. We provide 24 months after-sales service for this filter.
Show More
8
Craftsboys Fish Tank Filter, Silent Internal Aquarium Filter, Clean Water, Air Pump, Make Waves (4W-450L/H, Black)
Craftsboys
15% Off
Limited time deal
Why we love it
Promotes healthy aquatic environment.
Produces quiet operation.
Easy to clean.
Main Highlights
🐟【Biochemical Filtration】This fish tank filter has 1 box with biochemical cotton inside, can collect and filter the waste in water, make wave and circular flow, help to culture beneficial bacteria, create a healthy water environment for your fishes and turtles. The biochemical cotton is washable and reusable.
🐟【Increase Oxygen】The air inlet on the aquarium filter will increase oxygen level of the filtered water, make the fish more active. Also, a good supply of oxygen helps culture beneficial bacteria like nitrifying bacteria. You can adjust the oxygen supply by spinning the valve of air inlet. P.S.: The valve of the oxygen inlet should be placed outside the fish tank and contact with air.
🐟【Ultra Quiet】Premium pump motor is noiseless during operation. It is only 35 dB, almost like the whisper or the sound in a quiet library. We recommend to turn off the spin button and stop the air inlet process at night, so that the filter pump will be more quiet. This way, it will not affect the operation of the filtration.
🐟【Easy to Clean】It is very convenient to take out the biochemical cotton and wash it, or your can replace with other filter medium. If you have any questions about our products, please feel free to contact us and we will do our best to solve your problems.
🐟【Recommend Tank】20~60L Tank
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8.7
Excellent
Limited time deal
Check Price
8.7
Excellent
Craftsboys
Craftsboys Fish Tank Filter, Silent Internal Aquarium Filter, Clean Water, Air Pump, Make Waves (4W-450L/H, Black)
15% Off
Limited time deal
Check Price
Show More
Why we love it
Promotes healthy aquatic environment.
Produces quiet operation.
Easy to clean.
Main Highlights
🐟【Biochemical Filtration】This fish tank filter has 1 box with biochemical cotton inside, can collect and filter the waste in water, make wave and circular flow, help to culture beneficial bacteria, create a healthy water environment for your fishes and turtles. The biochemical cotton is washable and reusable.
🐟【Increase Oxygen】The air inlet on the aquarium filter will increase oxygen level of the filtered water, make the fish more active. Also, a good supply of oxygen helps culture beneficial bacteria like nitrifying bacteria. You can adjust the oxygen supply by spinning the valve of air inlet. P.S.: The valve of the oxygen inlet should be placed outside the fish tank and contact with air.
🐟【Ultra Quiet】Premium pump motor is noiseless during operation. It is only 35 dB, almost like the whisper or the sound in a quiet library. We recommend to turn off the spin button and stop the air inlet process at night, so that the filter pump will be more quiet. This way, it will not affect the operation of the filtration.
🐟【Easy to Clean】It is very convenient to take out the biochemical cotton and wash it, or your can replace with other filter medium. If you have any questions about our products, please feel free to contact us and we will do our best to solve your problems.
🐟【Recommend Tank】20~60L Tank
Show More
9
NICREW Slim Aquarium Filter, Quiet Fish Tank HOB Filters for up to 20L Aquariums, Adjustable Flow, 160 L/H, 3W
NICREW
12% Off
Why we love it
Slim and compact design.
3-in-1 filter cartridge.
Quiet operation, adjustable flow.
Main Highlights
Slim and compact design, hardly noticeable on the tank, great choice for nano tanks up to 20L.
3-in-1 filter cartridge provides optimal mechanical and biological filtration to maintain a clean aquatic environment. Replacement filters can be found at amazon.co.uk under the search term "B0CLNXH5JS"
Quiet operation with adjustable flow, doesn't overly disturb the fauna, perfect for shrimp or betta.
Patent pending priming system, auto restart if power is interrupted and restored.
Comes with everything you need right out of the box for easy setup and use. Include filter body, intake tube, extension tube, intake sponge, and filter cartridge.
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8.7
Excellent
Check Price
8.7
Excellent
NICREW
NICREW Slim Aquarium Filter, Quiet Fish Tank HOB Filters for up to 20L Aquariums, Adjustable Flow, 160 L/H, 3W
12% Off
Check Price
Show More
Why we love it
Slim and compact design.
3-in-1 filter cartridge.
Quiet operation, adjustable flow.
Main Highlights
Slim and compact design, hardly noticeable on the tank, great choice for nano tanks up to 20L.
3-in-1 filter cartridge provides optimal mechanical and biological filtration to maintain a clean aquatic environment. Replacement filters can be found at amazon.co.uk under the search term "B0CLNXH5JS"
Quiet operation with adjustable flow, doesn't overly disturb the fauna, perfect for shrimp or betta.
Patent pending priming system, auto restart if power is interrupted and restored.
Comes with everything you need right out of the box for easy setup and use. Include filter body, intake tube, extension tube, intake sponge, and filter cartridge.
Show More
10
Internal Fish Tank Filter, Multi Filter Materials, 3W Adjustable Water Flow Submersible Aquarium Filter Pump for 20l ~ 40l Freshwater Saltwater Fish Tank, 2 Mode Aeration & Rainfall, TE-100(210L/H)
Weipro
Why we love it
Multiple filtration methods available.
Strong performance for clear water.
Easy to clean and maintain.
Main Highlights
[Three Kinds of Filter Materials] The internal filter includes three types of filter media: activated carbon box, filter sponge, and ceramic ring box. It can adsorb impurities of different shapes and keep the water clear.
[Strong Filtering] Equipped with 3W-210L/H aquarium water filter pump, it circulates water at a speed of 210L per hour. For freshwater aquarium ranging from 20 to 40 liters, it can automatically clean the aquarium 4-6 times per hour.
[Three Kinds of Filtration Methods] This aquarium filter has three kinds of filtering modes. Water pump outlet can be equipped with three different accessories: spray bar, flat nozzle, and pointed nozzle. The spray bar produces a "rainfall" effect, the flat nozzle simulates waves, and the pointed nozzle sprays oxygen bubbles deep into the aquarium, more effectively increasing the oxygen content in the aquarium.
[Easy to clean] The aquarium filter pump can be easily disassembled and reassembled without tools. The housing and water inlet are designed to prevent snags and are harmless to fish.
[Application] Specially designed for freshwater saltwater aquariums ranging from 20l to 40l. Suitable for breeding various aquatic pets. If you have any questions, please contact us at any time.
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8.7
Excellent
Check Price
8.7
Excellent
Weipro
Internal Fish Tank Filter, Multi Filter Materials, 3W Adjustable Water Flow Submersible Aquarium Filter Pump for 20l ~ 40l Freshwater Saltwater Fish Tank, 2 Mode Aeration & Rainfall, TE-100(210L/H)
Check Price
Show More
Why we love it
Multiple filtration methods available.
Strong performance for clear water.
Easy to clean and maintain.
Main Highlights
[Three Kinds of Filter Materials] The internal filter includes three types of filter media: activated carbon box, filter sponge, and ceramic ring box. It can adsorb impurities of different shapes and keep the water clear.
[Strong Filtering] Equipped with 3W-210L/H aquarium water filter pump, it circulates water at a speed of 210L per hour. For freshwater aquarium ranging from 20 to 40 liters, it can automatically clean the aquarium 4-6 times per hour.
[Three Kinds of Filtration Methods] This aquarium filter has three kinds of filtering modes. Water pump outlet can be equipped with three different accessories: spray bar, flat nozzle, and pointed nozzle. The spray bar produces a "rainfall" effect, the flat nozzle simulates waves, and the pointed nozzle sprays oxygen bubbles deep into the aquarium, more effectively increasing the oxygen content in the aquarium.
[Easy to clean] The aquarium filter pump can be easily disassembled and reassembled without tools. The housing and water inlet are designed to prevent snags and are harmless to fish.
[Application] Specially designed for freshwater saltwater aquariums ranging from 20l to 40l. Suitable for breeding various aquatic pets. If you have any questions, please contact us at any time.
Show More
