Laguna Phosphate Control - 16 Ounces Laguna Phosphate Control naturally improves pond water clarity and overall pond conditions. Phosphate is a major nutrient that can stimulate undesirable pond conditions that result in unclear water. Micro-organisms in Phosphate Control's super-concentrated formula reduce phosphate levels. Phosphate Control contains a combination of powerful bacterial teams found in nature that improve water conditions for pond inhabitants. One 16 fluid ounce bottle treats 2,500 gallons of pond water.