Nitra-Zorb 7.4 oz treats 55 gallons 3 pk

Chemical filter media for the reduction of ammonia, nitrite and nitrate Rechargeable chemical filter resin for use with new or established freshwater aquariumsUse Nitra-Zorb to help reduce fish loss when setting up and cycling new aquariums A water filtration medium composed of natural and synthetic ion-exchange resins. Selectively removes toxic ammonia, nitrite, and nitrate. Contains no phosphate, will not affect pH, and is compatible with activated carbon. Media, in convenient pouch, can be easily recharged with freshwater aquarium salt. Small 20 gallon size fits easily in Whisper filters. For freshwater use only.