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What Type of Chlorine Should I Add to My Pool?

You can use four types of chlorine in a swimming pool. Each one has a pH value, available chlorine level and stability rating. Each of the types of chlorine comes in a different form.

Chlorine Should I Add to My Pool


Gas chlorine is inexpensive and provides 100 percent available chlorine with a pH value of 0.5 to 1.0. The gas is deadly if applied incorrectly and it is extremely unstable. You should avoid the gas form of chlorine, even though it is inexpensive.



Liquid chlorine is inexpensive and easy to add to the pool. The chlorine has a pH value of 13.0 to 14.0, which is high and only provides 12 to 15 percent available chlorine in the pool.

Salt is a byproduct in liquid chlorine and the liquid is unstable. This would not be the ideal form of chlorine to use.



Granular chlorine is very stable and has cyanuric acid as a byproduct, which reduces the loss of chlorine due to the hot sun. The available chlorine from granular chlorine is 63 percent and the pH value is 6.8. This chlorine is good for adding to pools when the chlorine level is extremely low.



Tablets come in 1 and 3 inch pucks, which you can add to the chlorinator. The chlorine tablets are slow dissolving with a pH value of 2.8 to 3.0. Cyanuric acid is a byproduct of tablets and they are extremely stable. This is the best chlorine to add to a pool when you maintain chlorine levels.


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