Blanket Answer is a unique blend of minerals and enzymes . The special formula works where many bacteria cultures fail. It is 100% safe for all pond fish plants and biological filtration systems. UV units or protein skimmers need not be switched off. Unlike other products on the market. Blanket Answer is simply added to the pond by pouring the mixed powder and pond water from a designated watering can evenly over the surface. The pond will initially take on a milky appearance but this will clear after about 4-7 days. The product works best in a constant water temperatures of 10Deg C and above results will vary depending on pond conditions if applied to water temperatures that drop below 10Deg C.