Maintain clean & clear water with these Multifunctional Chlorine Tablets, ideal for disinfecting and sanitising your swimming pool. Because these Chlorine Tablets have a higher pH value, you will see a reduction in the amount of pH regulation you need to do. In addition to this as well as being stabilised to reduce chlorine loss to sunlight, they also contain clarifier and algaecides. As a result they will also to help improve clarity and prevent algae formation. When dosed via the skimmer the tablet(s) will dissolve slowly over a 3 to 4 day period, the rate at which they dissolve will vary depending upon water flow and temperature.