Facts About Gas Chlorination

There are three forms of chlorine used to treat water, and the following is how those forms differ in strength and efficacy, cost and safety.

• Gas chlorine is 100 percent elemental chlorine and remains full strength no matter how long it is stored.
• Calcium hypochlorite loses strength as soon as it is open.
• Sodium hypochlorite loses up to 50 percent of its strength within 90 days of being opened.

• A year's supply of gas chlorine costs $12,000.
• Sodium costs $34,560 per year.
• Calcium costs $54,000 per year.

• 87.5 percent of incidents are related to sodium chlorine.
• Out of 69,804 chlorine exposures reported a year, only 9 percent are from chlorine gas.