HTH Easyclic

5-Buoy  has now been replaced with the HTH easy click . provides a constant input of 'background' chlorination over a period of several weeks. It acts in the top few centimetres of pool water where pollution is greatest to minimise the risk of bacterial and algal infection.
Ideal for regular use in conjunction with other chlorine sanitisers or for periods when the pool is not in use (eg when on holiday).