The Tetra® Whisper® Power Filter for aquariums offers quiet, 3-stage filtration for clean water and healthy fish. Dual-sided mesh catches debris and fish waste in its dense, fibrous network, then Ultra-Activated™ carbon provides chemical filtration by absorbing odors and discoloration. Biological filtration is provided by Bio-Foam®, which creates a large, three-dimensional area for cultivating aerobic bacteria, which eliminate toxic ammonia and nitrites. No moving parts means long-term reliability. Uses Stay Clean™ technology to help keep your aquarium clean, clear and healthy, reduce buildup on aquarium glass and bind small dirt particles to make them easier to filter. This filter uses easy-to-change Tetra Whisper Bio-Bag® Cartridges (size medium), which trap particles floating in your aquarium. The Tetra Whisper Power Filter 10 treats aquariums up to 10 gallons (90 GPH). Since 1951, Tetra has developed the world’s most 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 & RELIABLE: The Tetra® Whisper® Power Filter uses 3-stage filtration to create clear, clean water – PF 10 treats aquariums up to 10 gallons. ABSORBS ODORS: Ultra-Activated™ carbon removes both odor and water discoloration. CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste. INNOVATIVE CLEANING POWER: Integrated Stay Clean™ technology reduces buildup on glass and binds small dirt particles to make them easier to filter. CARTRIDGE REFILLS: Change cartridges monthly; uses medium-sized Tetra® Whisper® Bio-Bag® Cartridges (refills sold separately).