Q Power Filter with Stay Clean4echnology keeps aquarium water clean and clear. This quiet filter contains a soft barrier between the motor and the filter that serves as a sound shield to minimize noise. The bio-scrubber cultivates aerobic bacteria to remove toxic ammonia and nitrite, and the smart path spillway oxygenates the water and agitates the surface. With a self-priming, submerged motor and adjustable intake to fit your aquariumàneeds, the Tetra Whisper IQ Power Filter is perfect for use with both freshwater and marine fish. Works with easy-to-change Tetra Whisper Bio-Bagilter Cartridges with Stay Clean technology - helps reduce buildup on aquarium glass, bind small dirt particles to make them easier to filter and stabilize pH levels to prevent crashes, meaning easier aquarium maintenance for you. Tetra Whisper IQ Power Filters are available in a range of sizes to fit your aquarium. This Tetra Whisper IQ 20 Power Filter treats aquariums up to 20 gallons (130 GPH). Convenient color coding makes it simple to choose the correct size replacement cartridge - use with size large Tetra Whisper Bio-Bag Filter Cartridges (blue packaging). Since 1951, Tetra has developed the worldàmost comprehensive body of fish food knowledge, and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need - from a large variety of quality fish food and innovative equipment to test kits and decor." "QUIET AQUARIUM FILTER: The Tetra Whisper IQ Power Filter with Stay Clean technology contains a sound shield for quiet filtration less than 40 dB. | SELF PRIMING: Submerged motor starts up with no priming required. | CAPACITY: The Tetra Whisper IQ 20 Power Filter works in filters up to 20 gallons (130 GPH). | STAY CLEAN TECHNOLOGY: By maintaining healthy pH levels, creates easier maintenance for healthier fish. | CARTRIDGE REFILLS: Change cartridges monthly; uses large-sized Tetra Whisper Bio-Bag Filter Cartridges (refills sold separately).