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CALCIUM HYPOCHLORITE – CA(CLO)2

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[Abstract]:
Calcium hypochlorite is more stable than sodium hypochlorite, and contains a higher chlorine concentration (30-75%).The chemical reaction with water is:

Calcium hypochlorite is more stable than sodium hypochlorite, and contains a higher chlorine concentration (30-75%).The chemical reaction with water is:

Ca(OCl)2 + 2H2O <–> 2HOCl + Ca+2 + 2OH-

Like sodium hypochlorite, calcium hypochlorite also increases water pH, so it is advised to acidify the water during the disinfection process.

Calcium hypochlorite is available as white powder or tablets, therefore it should first be dissolved in water, and only then it is injected into the treated water. Calcium hypochlorite isn’t highly soluble, so it dissolves better in soft or medium-hard water. It is recommended to dissolve it in warm water, in order to improve its solubility.

In any case, all forms of calcium hypochlorite contain insoluble residues that form sediments in the solution. It is important to eliminate the sediment before injecting the calcium hypochlorite solution into the treated water tank to avoid clogging.

Advantages – Easy transport and storage, more stable than sodium hypochlorite, does not add sodium to the water, highly effective when correctly used.

Disadvantages – low solubility, might cause clogging, the final chlorine concentration in water is dependent on the extent of dissolution achieved.