Aquarium Pharmaceuticals Phos-Zorb (5.25oz) Selectively remove ammonia, nitrite & nitrate from freshwater and saltwater aquariums. Removes phosphate, a by-product of fish metabolism and decaying organic matter and an additive in some tap water supplies, aquarium products and filtration media
- Size 4 - Fits API Nexx Filter & Rena SmartFilter
- Size 6 - Can be used on any aquarium filter - treats up to 55 gallons
- Eliminates Cloudy water caused by phosphates
- Will not remove trace elements and will not affect pH
INSTRUCTIONS: Easy-to-use pouch works 2 months, change regularly for clean & clear water.