API Nitra-Zorb for API NexxFilter & Rena Smartfilter - Size 6 = 7.4 oz (Treats 55 Gallons)

API Nitra-Zorb for API and Rena Filters is a convenient pouch of natural and synthetic ion-exchange resins that selectively remove ammonia, nitrite, and nitrate from freshwater aquariums. Completely phosphate-free and ready to use! Removes toxic ammonia, nitrite and nitrate. Provides chemical filtration to support a successful aquarium startup. Ready to use pouch for freshwater fish tank. 1 large pouch treats up to 55 gallons. API Nitra-Zorb filtration pouches are scientifically proven to remove toxins in aquarium water, including NH3, NO2-, and NO3- to support the health and longevity of fish and plants.

Instructions: Easy-to-use pouch works 2 months, change regularly for clean and clear water.