1、Fine Filtration: Fish tank bio filter media provides mechanical and biological filtration and captures debris or waste without sucking up your fish, keeping the tank crystal clear. 2、Circulation Filtration: Aquarium canister filter is pneumatically filtered and flows through biochemical cotton and hollow quartz balls for effective filtration and accelerated water circulation. 3、Quiet and Aeration: Aquarium biological filter media is air powered and does not interfere with your daily life. Press the sponge in the tank to fully absorb the water to make it sink to the bottom. 4、Easy to Clean: Each aquarium filter can be easily disassembled for cleaning. Rinse with aquarium water every 2 ‑ 4 weeks. Do not use tap water for cleaning! 5、Application: Fish tank bio balls filter is suitable for breeding and raising all kinds of ornamental fish, shrimp or fry. It is also suitable for all kinds of fish tanks and aquariums.