Seachem 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. Use 60 ml for every 50 gallons of saltwater or 100 US gallons freshwater. Leave product in place for 4 days, then test phosphate or silicate concentrations with eith the Seachem MultiTest Phosphate Test Kit or the Seachem MultiTest Silicate Test Kit It may be used in a canister filter, media chamber, box filter, or any high flow area of a trickle filter.