Relax Small 20g Chlorine tablets - 1kgChlorine is the most popular treatment for keeping swimming pool water chemistry balanced because it's highly effective and relatively low cost. Other disinfectants include bromine, ozone, and ultraviolet (UV) radiation. Chlorine can be added to pool water in several ways, including liquids, tablets and granules. Liquids can simply be poured into the water. Tablets can be added to a chlorine dispenser, in the pools swimmer basket or to an automatic