>Eligible for Free Shipping Choose Options Compare API NITRA-ZORB Aquarium Filter Media Size 6 1 Pack API MSRP: Now: $18.84 Was: Composed of natural and synthetic ion-exchange resins in a convenient pouch. Selectively removes ammonia, nitrite and nitrate from freshwater aquariums. Completely rechargeable with Doc Wellfish's Aquarium Salt. MSRP: Now: $18.84 Was: Choose Options Compare Qty in Cart: 0 Price: MSRP: Now: $18.84 Was: Subtotal: Choose Options