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How is Combined Chlorine Removed from Pool Water?Combined chlorine is a mixture of chemicals called chloramines and they very slowly break up in water. This process can be speeded up by adding an oxidiser, such as Shock Chlorine (calcium hypochlorite granules) or Oxy Shock (potassium mono-persulphate). The traditional shock treatment for pools is to add 500grams of calcium hypochlorite granules per 10,000 gallons of pool water every fortnight. This boosts the chlorine level to 6ppm.