What Is Calcium Hypochlorite (CHC)

 Calcium hypochlorite is a white solid that you can purchase in granular or tablet form. It is used to disinfect water and kill off bacteria that could make you sick. Its uses extend to swimming pools, drinking water for small communities and industrial food processing.

Calcium Hypochlorite CHC 70%( also called bleaching powder) is a white crystalline solid, decomposes at 170 C, decomposes  in water and alcohol, not hygroscopic, practically clear in water solution. It is produced by passing chlorine gas over slaked lime. Chlorine is a general biocide substance killing germs, micro-organisms, algae, etc. The most widely used chloride chemical disinfectants are chlorine, ozone, chlorine dioxide and chloramine. Hypochlorite is an alternative choline source when chlorine gas is impractical. The commercially available liquid form is sodium hypochlorite (NaOCl). Hypochlorite is the common name for chlorate(I) salt. 

Calcium Hypochlorite quickly forms hypochlorous acid (the killing form of chlorine) in water. It is used in water treatment as a general biocide. Calcium hypochlorite is used by many paper conservationists to bleach archival papers, and it is used as an oxidizing agent to reduce the effects of foxing. Any hypochlorite of calcium, the normal anhydrous salt (Ca(ClO)2), that is generally found in commercial products contains 50 to 75% available chlorine. It is used as a bleaching agent (paper, textiles), bactericide, deodorant, water Purification, sterilizer, chlorine chemical for swimming pools, fungicide and in sanitary Installations.

Using Calcium Hypochlorite in your Pool

To keep your pool sanitized, you need to shock it regularly. Therefore, you should shock your pool regularly. Instance during which you would want to shock your pool include after heavy rain, after increased use i.e. pool party, and if your water levels have significantly changed.

To shock your pool using calcium hypochlorite, take the following steps:

Get a 20 liter (5-gallon) bucket and fill it with water.

Add calcium hypochlorite tablets or granules.

Stir the water to dilute the chemical and then slowly pour it directly into your pool.

Know More About Chlorine

The most common choice for those converting away from chlorine gas is sodium hypochlorite, which is available delivered in bulk at a free available chlorine (FAC) concentration ranging from 10 to 15 percent. It is also possible to generate hypochlorite on-site at a low concentration (less than 1 percent FAC) by passing a brine solution through an electrolytic cell. Hypochlorite as a bulk chemical is referred to by various descriptors, including delivered hypochlorite, commercial hypochlorite, concentrated hypochlorite and bulk bleach. On-site generation of a dilute hypochlorite solution is abbreviated as OSG.

Commercial hypochlorite is highly concentrated and high in pH. Typical chlorine concentrations range from 10 to 15 percent, or 100,000 to 150,000 milligrams/liter (mg/L), and pH values of 12 to 13 are common. In contrast, OSG is generated at a concentration ranging from 0.25 to 0.8 percent, or 2,500 to 8,000 mg/L, far below the 1 percent safety threshold of the Hazardous Communications Standard. In fact, no regulatory requirements are associated with hypochlorite generated on-site at low chlorine concentrations. In addition, the pH value of OSG is around 9, only two orders of magnitude away from a neutral pH, rather than 5 to 6 orders of magnitude as with commercial bleach.


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