Aqua-Tech power aquarium filter 3-Step filtration, 30-60 gallons there's more to fishkeeping than selecting some fish, buying an aquarium, and calling it a day. This Aqua-Tech 30 to 60-gallon aquarium filter helps create a cleaner tank for your fish so they can live a happy and healthy life. It uses bio-tech advanced complete 3-stage biological filtration for ultra-quiet operation and removes dissolved waste. Activated carbon removes odors, discolorations, and impurities, while the biological grid eliminates toxic ammonia and nitrite on contact. With little maintenance required, this aquarium water filter is fast to clean and easy to use. It also takes the guesswork out of replacing your filter cartridge.