The Chlorine Floater Buddy ECONO 1.3kg (POOLS UP TO 40000LT) is a long lasting, stabilised chlorine floater with 90% available chlorine to control bacteria and algae in pool water. Dosage and Directions for use: Cut off the appropriate number of nubs according to the pool size and place the floater in the pool. Pool water requires a shock treatment every 2 weeks in summer, possibly weekly depending on the bather load, hot, humid weather or after heavy rain.