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