Use PHOSfree to eliminate phosphates from your pool naturally. PHOSfree continually removes phosphates as they enter the water, keeping phosphate levels to near zero. This allows normal sanitizer levels to prevent algae growth that will reduce pool maintenance. In addition, it is gentle on the skin, non-toxic and 100% safe for your family and the environment. Use 1 capful per 8,000 gallons of water. Use weekly.