API Bio-Chem Zorb for Filstar XP, Nexx & Rena SmartFilter - Size 6 (1 Pack)

API Bio-Chem Zorb (formerly branded Rena Bio-Chem Zorb) is the most scientifically-advanced filter media available. Use Bio-Chem Zorb for sparkling clean water and healthy fish! Removes organic waste, toxic gases, water discoloration, foul odors and phenols in fresh and saltwater aquariums. Removes toxic heavy metals in freshwater. Bio-Chem Zorb will not release phosphates. Bio-Chem Zorb is a blend of 2 research-grade scavenger resins, 2 pharmaceutical-grade ion-exchange resins and high porosity activated carbon in a convenient filter pouch.

Directions: Easy-to-use pouch works three to six months, change regularly for clean and clear water.

Specifications: Size 4 - Fits API Nexx Filter and Rena SmartFilter. Size 6 - Can be used on any aquarium filter including the API XP Canister Filter up to 55 gallons.