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S A T U R A T I O N I N D E X
Test the water for pH, Alkalinity, Calcium Hardness, and Temperature, then follow the simple steps below:
1. Write your pool’s pH level here:
pH: ________
2. Find your Alkalinity level in the chart below, and write the
corresponding Alkalinity Factor here:
Alkalinity Factor: ________
Pool
Alkalinity 5 25 50 75 100 150 200 300 400
Factor
0.7 1.4 1.7 1.9 2.0 2.2 2.3 2.5 2.6
3. Find your Calcium level in the chart below, and write the
corresponding Calcium Factor here:
Calcium Factor: ________
Pool Calcium
(CaCO
3
)
5 25 50 75 100 150 200 300 400
Factor
0.3 1.0 1.3 1.5 1.6 1.8 1.9 2.1 2.2
4. Find your pool temperature in the chart below, and write the
corresponding Temperature Factor here:
Temperature Factor: ________
Pool
Temp 32 37 46 53 60 66 76 84 94 105
Factor
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
5. Add the results from steps 1 through 4 above and write the result here: Total of above: ________
- 12.2
6. Subtract 12.2 from step 5 and write the result here:
Saturation Index =
____
If the Saturation Index above is between –0.3 and +0.3, the water is well balanced.
If the Index is more than 0.3, the water will tend to cause scaling or get cloudy. Alkalinity and pH
should be reduced accordingly, but maintained within recommended levels.
If the Index is less than -0.3, the water will tend to be aggressive toward the pool surface, equipment,
and bathers. Alkalinity and pH should be increased accordingly, but maintained within recommended
levels.
