API Phos-Zorb is a specialized, synthetic absorption filtration media that selectively removes phosphate in fresh and saltwater aquariums, as well as silicate found in tap water. Promotes the growth of reef-building corals and prevents calcium precipitation caused by excess phosphate. This item is safe for all fish, invertebrates and planted aquariums.
Size: 5.5 oz. (Treats up to 55 gallons).