Features Rapidly removes phosphate & silicate Ferric oxide coated aluminum oxide phosphate adsorber High porosity and surface area give it a large binding capacity Overview PhosBond™ is a revolutionary new product that combines the phosphate removing capabilities of both aluminum oxide and granular ferric oxide into a singular material forming a synergistic effect. It rapidly removes phosphates and silicates from saltwater and freshwater, combining the best of both types of phosphate removers. Its high porosity and surface area give it a large binding capacity, while its physical strength and integrity assures that it will not break down from mechanical stress. Comparing Seachem Phosphate Removers Product PO 4 bound PhosGuard (Alumina Oxide) 0.87 mg/g PhosBond (GFO and Alumina Oxide hybrid) 1.19 mg/g PhosNet (GFO) 1.41 mg/g