Dr. G's Phosphate Remover permanently removes Phosphates, Arsenic, Silica, Heavy Metals, Organic Compounds and other pollutants. Packed pure, dry, without added moisture and 100 grams more than other leading brands. Phosphates in your tank are a by-product of excess food and decomposed organic wastes from fish and other living creatures. Excellent aid in controlling Cyano-Bacteria and Diatoms flares.