... Increases the free chlorine content of the pool water.To control and kill bacterial and algae in swimming pools. Size:0.5kg (or ... (or 2lb),2kg (or 5lb),3kg,4kg (or 10lb),8kg and 10kg of Pillow Bags, Doy Packs,Gusseted Bags.0.5kg ... (or 2lb), 2kg (or 5lb), 3kg, 4kg (or 10lb), 8kg and 10kg of Pails, Jars, Jugs, Pots, Tubes, Drums ...