SpaBoss Shock 1kgNon Chlorine Oxidizing Shock 1kg. (will not alternate pH or alkalinity) Treatment for spas using chlorine or bromine With both Bromine or Chlorine sanitizing systems contaminants may build up during the week. Spa hot tubs should be shocked with Spa Shock at a rate of 100 grams per 1,500 litres of water. This will eliminate any odour and restore clarity to the water. Heavy daily use may require additional shock treatments.