Acceptible chemical level guidelines

Control

Ideal

Min

Max

Comments

pH

7.4

7.2

7.6

 

Free Chlorine

1.5 to 3ppm

1.0ppm

10ppm

Shock dose 

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