Aquarium Pharmaceuticals Nitra-Zorb is a convenient pouch of natural and synthetic ion-exchange resins that selectively remove ammonia, nitrite, and nitrate from freshwater aquariums. Completely phosphate-free. Rechargeable ion-exchange filter media in a pouch.
- Size 4 - Fits API Nexx Filter & Rena SmartFilter
- Size 6 - Can be used on any aquarium filter - treats up to 55 gallons
- Removes toxic ammonia, nitrite & nitrate
INSTRUCTIONS: Easy-to-use pouch works 2 months, change regularly for clean & clear water.