KleenPool Algaecide can be used for winterising your outdoor swimming pool at a dose rate of 1 litre treating 20,000 litres. One of the leading brand copper based algaecide for the control of algae. Kleen Pool Longlife Algaecide will maintain your pool free of most algae for periods up to 6 months. One simple application of Kleen Pool Longlife Algaecide will free you from the problems caused by algae blooms, discolouration and hazes which can affect the appearance of your pool. When your pool is not being used for swimming, such as holiday times and throughout the winter, Kleen Pool Longlife Algaecide will keep your pool clear and free of most algae without the use of other pool chemicals.