Granular Chlorine – Calcium Hypochlorite

Formula
ph
Available Cl
Molar mass
Cl/kg(65%)/ 50kL
Ca2(ClO)
11.7
48 - 73%
142.98g/mol
12.9ppm
Granular Chlorine is very commonly used in the sanitation of swimming pools. It has a high percentage of available chlorine without the risk of also adding too much sunblock (as is the case with DiChlor and TriChlor)

Granular chlorine is best dissolved in a large bucket before being added to your pool water. It can be added directly to pool water, but there are various precautions that need to be taken! Granular chlorine is a heavy substance, and when it is added to the water without first being dissolved, it sinks and sits directly on the floor of the pool until fully dissolved. This can be a serious problem depending on your pool surface. High chlorine concentrations directly in contact with vinyl cause staining and an ugly deformation. Granular chlorine can also stain plaster.

Granular chlorine is also a very effective way to shock a green pool. But keep in mind that it will also add Calcium to your pool, and if your Calcium level is already a bit high it can result in permanently cloudy water and promote scaling at the water line and in equipment.

Like liquid chlorine, granular chlorine also has a large raising effect on the ph of your pool which will require a ph down product, such as soda ash or muriatic acid in order to keep the ph within safe range.

Calcium Hypochlorite Structure

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