Calcium Hypochlorite Tablets (Cal Hypo)


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Concentrated chlorine can be used in a number of applications including evaporative cooling, down water services and drinking water supply.

Dosing swimming pool water, to kill bacteria and breakdown organic contaminants.

A highly effective oxidising biocide giving excellent biological control at low dose rates.


Physical State White/off white tablet
Odour Distinctive chlorine odour


Dependent upon specific application.

  • For evaporative cooling refer to HSE document L8 “The control of legionella bacteria in water systems”.
  • For drinking water the product should be utilized in conjunction with suitable measurement and control equipment.
  • For pool water, test the pool water with a suitable test kit to determine chlorine levels. A free reserve of 1 to 3 ppm as free chlorine should be achieved.

For guidance:-

  • Dissolution rates will vary according to water hardness and temperature, as a guide in soft water approx 4.3g will dissolve in 1 litre.
  • To increase the chlorine level by 1mg/litre (ppm) add 15g of calcium hypochlorite per 10m3 of water.
  • Use suitable testing equipment such as DPD No1 tablets and colour chart or disk.


This product should only be used with very low hardness and low alkalinity water supply, otherwise precipitation may be observed. A dealk vessel fitted to the water supply can be used for when mains water alkalinity is >150ppm.

Handling and Storage

Please refer to safety data sheet for detailed handling/storage instructions.

  • WTP CS CHLOR (CAL HYPO) should be stored in dark conditions and exposure to sunlight should be kept to a minimum.
  • WTP CS CHLOR (CAL HYPO) should not be stored with organic materials or acids. 

Potential Hazards

Contact with acids liberates toxic (R31) chlorine gas. See material safety sheet for full safety and spillage procedures.


WTP CS CHLOR (CAL HYPO) is available in 3.6kg HDPE jars.


Field Representatives will work closely with customer personnel to assure the effective application of the water treatment programme. Regular service calls can be provided by qualified personnel.

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The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The company shall not be held liable for any damage resulting from handling, contact, mis-use or mis-application of the above product. In all instances the user should satisfy themselves that this product is suitable for the anticipated application and should carry out suitable and sufficient risk/COSHH assessments and a method of use statement.

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