Calcium Hypochlorite Briquettes / Pellets (7g) - Shock Chlorine

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SizePrice ex VATPrice inc VAT
1Kg £14.98 £17.98
5Kg £29.16 £34.99
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Shock Chlorine Briquettes / pellets ~70%

Technical grade

The unique and patented “pillow shaped” briquette weighs 7gms and ensures great efficiency with minimal wastage. The briquette form offers an enhanced COSHH rating and has ~70% available chlorine content.

Calcium hypochlorite is a chemical with the formula Ca(ClO)2. It is widely used for water treatment and as a bleaching agent (bleaching powder). This chemical is considered to be relatively stable and has greater available chlorine (~70%) than sodium hypochlorite (liquid bleach).



Calcium hypochlorite is used for the disinfection of drinking water or swimming pool water. For use in outdoor swimming pools, calcium hypochlorite can be used as a sanitizer in combination with a cyanuric acid stabilizer. The stabilizer will reduce the loss of chlorine because of UV radiation. Calcium does make the water hard and tends to clog up some filters. However, some types of calcium hypochlorite do contain anti-scaling agents in order to prevent clogging up of pipes/filters. This grade of calcium hypochlorite can also be used in hard waters. The main advantage of calcium hypochlorite is that it is unstabilised unlike chlorinated isocyanurates such as sodium dichloroisocy­anurate or trichloroisocy­anuric acid. Latter products do contain cyanuric acid. If the level of cyanuric acid becomes too high, it will influence the performance of the chlorine.

Pools running on calcium hypochlorite should have a chlorine level of 1-2 ppm (mg/L).

Properties of calcium hypochlorite

  • Other names: Hypochlorous acid, calcium salt / Bleaching powder / Calcium Oxychloride
  • CAS No: 7778-54-3
  • EC No: 231-908-7
  • UN No: 1748
  • Appearance: white or grey/white pellets with odour of chlorine
  • Molar Mass: 142.98 g/mol
  • Density: 2.35 g/cm3
  • Melting Point: 100oC

Health & Safety:

CLASS C: Oxidizing material. CLASS E: Corrosive solid.

R22- Harmful if swallowed. R38- Irritating to skin. R41- Risk of serious damage to eyes.


PLEASE NOTE: This product is not for human or animal consumption.


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