WATER CHEMISTRY FOR SWIMMING POOLS

Chemicals used in Swimming Pools:
Proper water chemistry is essential to maintaining safe and consistent swimming pool operation. Chemicals used in swimming pools include: Disinfectants to destroy harmful or otherwise objectionable organisms; Alkalinity and pH Adjusters to maintain a consistent acid-base relationship and acid buffering capacity; Chlorine Stabilizer to prevent unnecessary loss of chlorine; Algicide to kill and prevent algae, and Filter Aids to help remove foreign material. Following is a discussion of various factors which affect water chemistry, how they affect swimming pools and how to use pool chemicals to restore a properly balanced water chemistry.

Suggested NSPI Standards – Swimming Pools

Minimum Ideal Maximum
Free Chlorine, ppm 1.0 1.0-3.0 3.0
Combined chlorine, ppm None None 0.2
Bromine, ppm 2.0 2.0-4.0 4.0
pH 7.2 7.4-7.6 7.8
Total Alkalinity, ppm 60 80-100 180
(for Liquid Chlorine, Cal-Hypo and Lithium Hypo)
100-120
(for gas chlorine, dichlor, trichlor and bromine compounds)
TDS,ppm 300 1000-2000 3000
Calcium Hardness, ppm 150 200-400 500-1000+
Cyanuric Acid, ppm 10 30-50 150

Suggested NSPI Standards – Spas

Minimum IdealMaximum
Free Chlorine, ppm 1.0 1.0-3.0 10.0
Combined chlorine, ppm None None 0.2
Bromine, ppm 2.0 2.0-4.0 10.0
pH 7.2 7.4-7.6 7.8
Total Alkalinity, ppm 60 80-100 180
(for Liquid Chlorine, Cal-Hypo and Lithium Hypo)
100-120
(for Gas Chlorine, Dichlor,Trichlor and Bromine Compounds)
TDS,ppm 300 1000-2000 3000
Calcium Hardness, ppm 150 200-400 500-1000+
Cyanuric Acid, ppm 10 30-50 150
(except where limited by Health Dept. requirements, often to 100 ppm)
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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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