Page 19
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 ________
Pool Alkalinity
Factor
3.
Find your Calcium level in the chart below, and write the corresponding Calcium Factor here:
Calcium Factor ________
Pool Calcium
Factor
4.
Find your pool temperature in the chart below, and write the corresponding Temperature
Factor here: Temperature Factor ________
Pool Temp
Factor
5.
Add the results from steps 1 through 4 above and write the result here: Total Above ________
6.
Subtract 12.2 from step 5 and write the result here:
• 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.
5
25
50
0.7
1.4
1.7
5
25
50
0.3
1
1.3
32
37
46
0
0.1
0.2
NOTE
75
100
150
1.9
2.0
2.2
75
100
150
1.5
1.6
1.8
53
60
66
0.3
0.4
0.5
Saturation Index = ________
200
300
400
2.3
2.5
2.6
200
300
400
1.9
2.1
2.2
76
84
94
0.6
0.7
0.8
____-12.2
105
0.9