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Section 6.4 Calculating Saturation Index
Test the water for pH, Alkalinity, Calcium Hardness, and Temperature, then follow the simple steps
below:
1.
Write your pools pH level here: pH ________
2.
Find your Alkalinity level in the chart below, and write the corresponding Alkalinity Factor
here: Alkalinity Factor ________
3.
Find your Calcium level in the chart below, and write the corresponding Calcium Factor here:
Calcium Factor ________
Pool Calcium
5
25
50
75
100
150
200
300
400
Factor
0.3
1
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
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
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
5.
Add the results from steps 1 through 4 above and write the result here: Total Above ________
____-12.2
6.
Subtract 12.2 from step 5 and write the result here:
Saturation Index = ________
NOTE
•
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.
