Acceptable chemical levels in swimming pool water

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Swimming Pool and Spa Water − Acceptable Chemical Levels

Control	Ideal	Min	Max	Comments
pH	7.4	7.2	7.6
Free Chlorine	1.5 to 3ppm	1.0ppm	10ppm
Combined Chlorine			0.5ppm	Absolute max 1.0 ppm
Total Alkalinity	100ppm	80ppm	150ppm
Calcium hardness	275ppm	75ppm	500ppm
Cyanuric Acid	30ppm		60ppm	Not always used
Sulphates			300ppm	New Pools 200ppm
Chlorides			600ppm

The measurement of chemical levels and evaluation of Pool and Spa waters is often referred to as the Water Balance. e.g. :- If the pH level is out of range then the effectiveness of the Chlorine will be compromised.

Click here for detailed description of Water Balance