Chlorine for swimming pool

Item: STAR-CHLON – Made in Japan
Description: 70% Chlorine Granules

Calcium hypochlorite is commonly used for swimming pool. It is dry form of chlorine often called cal-hypo. It is available usually in granular and less common in tablets form. It is also known as unstabilized Chlorine.  Unstabilized Chlorine is very sensitive to UV radiation and it does not contains stabilizer. Without the protection of stabilizer,  the chlorine level will drop till very low within two hours under hot Singapore weather.

Chlorine content will range from 65% to 70% depending on the manufacturing. Chlorine from USA is typically 65% and Japan is 70%. pH of Calcium hypochlorite is 8.5 to 11.

Advantage and disadvantage: USA and Japan vs China

Calcium hypochlorite from USA and Japan will slightly increase the pH level and normally there is no need to consistently adjust the pH lower with dry acid. Calcium hypochlorite from China will increase the pH level by a lot and will need to adjust the pH level every time. The price advantage of the cheaper chinese chlorine do not justify the extra time and effort you take to adjust the pH.


Calcium hypochlorite is very effective against bacteria, algae, slime, fungi and harmful microorganisms.

Common applications of calcium hypochlorite are

Sterilization for swimming pool, spa and hot tub

Sterilization for water supplies and sewage

Sanitization for food and beverage, dairies, restaurants, farms etc…

Bleaching of pulp, paper, fiber and pepper

Treatment of waster effluents for industries such as food processing plants, textile mills, tanneries etc…

Treatment of water for industrial cooling systems

Disinfectant for general cleaning for floors, toilets

Washing vegetables & fruits


Water Tank Cleaning / Maintenance in Singapore

Water storage tanks needed to be clean & sterilize annually in accordance with the Public Utilities (Water Supply) Regulations
and Singapore Standard CP48 – Code of Practice for Water Services. License plumber has to be engaged to certify that the water tank are in a condition fit and safe for the storage of potable water. Access into the water tank is locked to prevent contamination.

Chlorine Requirement: 50 ppm of free chlorine

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