These concentrated un-stabilized chlorine granules are for superchlorinating (shocking) or routine maintenance. Clean filter as needed and adjust water balance. Apply product when pool is not in use and with the pump running. Ideal application is after dusk. Broadcast product over the entire deep end of the water. Brush or vacuum any un-dissolved material off surfaces. Cold water and other conditions may affect solubility of chlorine. Ensure that any material that may have settled to pool bottom, especially on bleachable surfaces, are swept into solution or vacuumed. For normal use, add 1 pound per 10,000 gallons of water with the pump running. Use weekly or after heavy swimmer use, heavy rain or wind. Reentry to pool is permitted once chlorine levels are below 4 ppm.