A fast acting shock treatment that kills bacteria and algae, quickly clears cloudy water and eliminates harmful swimmer wastes.  It is convenient to use and you can shock and swim in 15 minutes.  One 450g bag will treat a pool of up to 50 000 litres.  Shock treatments restore water clarity and eliminate the main cause of eye, skin and nose irritation. Many times, pool owners begin to shock treat the water after a problem occurs. However, a much better practice is to look at shocking the pool water as a preventive rather than a cure.