Seachem PhosBondFeatures: Rapidly removes phosphate and silicate Ferric oxide coated aluminum oxide phosphate absorber High porosity and surface area give it a large binding capacity Directions: For best results, PhosBond should be rinsed before use and placed so as to maximize the flow of water through it but not so that it tumbles against itself in flow. It may be used in a canister filter, media chamber, box filter, or any high flow area of a trickle filter. Use