Chlorine is proven to sanitize and disinfect. Chlorine effectively kills bacteria and other disease causing organisms, and removes waste products through oxidation. Today, chlorine remains the most widely used, effective and economical sanitizing agent for pools.

chlorine symbol

Types of Chlorine
Different compounds are available for adding chlorine to the water. Chlorine compounds vary in concentration, quality and potential “other effects” on your pool water. In general, chlorine compounds can be classified as follows:
Granular Chlorine is used as a daily hand feed application and as a chlorine “booster”.
The two most effective forms of granular chlorine are:
Calcium Hypochlorite – low cost, 65-73% available chlorine, contains some insoluble ingredients.
Di-Clor Chlorine Concentrate – 100% soluble, pre-stabilized for longer life.

3 Inch Chlorine Tabs, Pucks, Sticks, 1″ Inch Tablets
These are slow dissolving, stabilized, highly concentrated forms of chlorine that can be added directly to your skimmer basket* or automatic chlorine feeder. These constant feed methods are generally preferable to daily hand feeding. The most popular forms of chlorine for Semi and Automatic chlorination are pre-stabilized and contain 99% active “Tri-Clor” ingredients as follows:
3″ Big Tabs/Pucks – 7 oz. Tabs, used in some feeders
1″ Small Tabs – 1/2 oz. Tabs that are used in most feeders

How Much Chlorine?
The chlorine level should be regularly tested and maintained between 1.5 and 3.0 ppm. Many factors affect the consumption of chlorine such as sunlight, water temperature, pH, bather usage, and contaminates blown into the pool by wind and rain. Therefore, there is no reliable chart to properly calculate how much chlorine should be added to any particular pool. However, as a rule of thumb, 1 lb. of granular chlorine will raise a typical 20,000 gallon pool 2 ppm. A 20,000 pool will use about 2-3 pounds per week of Tablets or Sticks. Of course, this will vary based upon the factors mentioned above.

Sunlight is a major factor in the consumption of chlorine. When Stabilizer is added to the water, it combines with the chlorine and makes the chlorine more resistant to the UV rays of the sun. Stabilized chlorine remains in the water longer, thus requiring less chlorine to replace what has been consumed by the sunlight. Stabilizer helps keep your chlorine levels constant while reducing your chlorine costs. Have your stabilizer level checked every 6 weeks. The stabilizer level should be between 40-80 ppm. Six pounds of Stabilizer will raise a 20,000 gal. pool by 30 ppm. Unlike chlorine, Stabilizer is lost only through splash-out and backwash. And because many forms of chlorine contain stabilizer, you may not need to add stabilizer every season.

Alternatives to Chlorine There are some exciting alternatives to the traditional chlorine applications. Some of these, such as ozone, are excellent . . . others are not as efficient.

*Using pucks or tablets in your skimmer is NOT recommended.

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