The short answers are liquid chlorine and sodium dichlor. If you want a greater explanation please read on.

“Liquid Chlorine” (sodium hypochlorite)
So called Liquid chlorine (sodium hypochlorite, chemical formula NaOCl in NaOH (caustic soda)) is manufactured by bubbling chlorine gas through a solution of caustic soda (NaOH). At l0-percent available chlorine 1 gallon of liquid chlorine contains about 17 ounces (0.5 kg) of available chlorine. Liquid chlorine, when added to water makes hypochlorous acid (the killing form of chlorine) instantly. It can be used regularly or for superchlorination. Liquid chlorine is non-flammable and is compatible with other water-treating chemicals commonly found in a pool or hot tub.

Cyanuric acid should be added separately to keep the chlorine in the pool from being degraded by sunlight.

Sodium Dichlor
Sodium dichlor (sodium dichloro-s-triazinetrione, chemical formula NaCl2C3N3O3) is the only popular type of chlorine that does not require the addition of either a neutralizing chemical or Cyanuric acid.  Sodium dichlor is produced by adding soda ash and Cyanuric acid to a solution of trichlor. When dried the result is a granule that may provide 56 percent or 62 percent available chlorine, depending on the method of manufacture. The 56-percent formulation is by far the most readily available of the two.

Sodium dichlor is fast dissolving, will not cloud the water and has a long shelf life. It can be used for regular and for superchlorination. Because it is fast dissolving, it cannot be used in a dry chemical feeder. It should not be pre-dissolved and dispensed in a liquid chlorinator.

Sodium dichlor can cause a build-up of Cyanuric acid in the pool water. It is 57% stabilizer (Cyanuric acid) by weight. Cyanuric acid levels should be more frequently checked. Partial drain and refill the pool is required if the Cyanuric acid level exceeds 100 ppm.
Sodium dichlor is the second most expensive per kg of available chlorine but it does not have any “hidden costs” associated with it.
Sodium Dichlor has a pH close to 7 (neutral) and so does not require any neutralizing chemicals to be added to the water. It already contains Cyanuric acid saving on this cost also.  Roughly 2.2 pounds (1 kg) of sodium dichlor provides 1.2 lbs (560 g) of available chlorine.

Sodium dichlor (sodium dichloro-s-triazinetrione, chemical formula NaCl2C3N3O3) is the only popular type of chlorine that does not require the addition of either a neutralizing chemical or Cyanuric acid.

Sodium dichlor is produced by adding soda ash and Cyanuric acid to a solution of trichlor. When dried the result is a granule that may provide 56 percent or 62 percent available chlorine, depending on the method of manufacture. The 56-percent formulation is by far the most readily available of the two.

Sodium dichlor is fast dissolving, will not cloud the water and has a long shelf life. It can be used for regular and for superchlorination. Because it is fast dissolving, it cannot be used in a dry chemical feeder. It should not be pre-dissolved and dispensed in a liquid chlorinator.

Sodium dichlor can cause a build-up of Cyanuric acid in the pool water. It is 57% stabilizer (Cyanuric acid) by weight. Cyanuric acid levels should be more frequently checked. Partial drain and refill the pool is required if the Cyanuric acid level exceeds 100 ppM. One kg of sodium dichlor contains slightly more than 560gms of available chlorine and 570 g of stabilizer.

Sodium dichlor is the second most expensive per kg of available chlorine but it does not have any “hidden costs” associated with it.

Sodium Dichlor has a pH close to 7 (neutral) and so does not require any neutralizing chemicals to be added to the water. It already contains Cyanuric acid saving on this cost also.

Roughly 2.2 pounds (1 kg) of sodium dichlor provides 1.2 lbs (560 g) of available chlorine.

Red Square Pools
Vaughn Berger
Persident / Founder
http://www.redsquarepools.com
702-530-7331

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About Red Square Pools

Thank you for checking out our blog...we appreciate you taking the time to read our posts. To be quite honest, our posts come from your questions. Red Square Pool's wants to clear up the confusion and frustration of maintaining your pool and spa. We simply want to make Pool Maintenance and Repair SIMPLIFIED!! Let us know what your thinking by dropping us an email at info@redsquarepools.com. Have a safe and happy swimming experience!

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