This Swimming Pool Winterising Kit Will See Your Swimming Pool through the winter period: It comes with 1 litre longlife Kleen Pool algaecide, 1kg Shock Pot and 1.5kg Multifunctional Chlorine dispenser. Shock Your Swimming pool with the shock pot to ensure the pool is clear. Leave the chlorine dispenser in the pool on the highest setting and leave it to float around. Once the Pool is clear and has a high chlorine level, add the algaecide and then allow the pump to run so the chlorine and algaecide can disperse through the water, then To Lower The Water Level to just below the skimmer. And Your Pool Will Stay Clean For Months! Make sure You leave the floating dispenser in the pool throughout the winter!