Directions: Fill automatic or floating chlorine feeder with tablets and adjust rate to achieve 1 to 3 ppm. Test the chlorine residual in the pool water frequently. DO NOT add other product to the skimmer or chemical feeder while Pure Tabs are in the skimmer. To prevent fire and explosion, do not use a chemical feeder with any other chemical type of chlorine other than the type first used in the chemical feeder (residual imbedded into the plastic can react with an incompatible chemical).