A Top Quality Branded Product, this 200g tablet releases chlorine over a 3-5 day period depending on water flow. It is high in Chlorine content. Prior to using this product adjust the pH levels to the ideal range of 7.2-7.6 and as this product releases chlorine relatively slowly it may be necessary to shock dose or oxidise the pool or hot tub prior to its first use. Do Not ADD directly to the pool – place either in the skimmer or floating dispenser. Please read the instructions on the packaging of this product prior to use. Also available in 5Kg tubs.