Blueworks BLH Series - Page 7

7 | P a g e
Si = pH + Ti + Ci + Ai - 12.1
℃
℉
Ti
Calcium
Hardness
Ci
Total
Alkalinity
Ai
12
53
.3
75
100
125
150
200
250
300
400
600
800
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.4
2.5
75
100
125
150
200
250
300
400
600
800
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
2.9
16
60
.4
19
66
.5
24
76
.6
29
84
.7
34
94
.8
39
103
.9
How to use: Measure pool pH, temperature, calcium hardness, and total
alkalinity. Use the chart above to determine Ti, Ci, and Ai from your
measurements. Insert values of pH, Ti, Ci, and Ai into the above
equation. If Si equals .2 or more, scaling and staining may occur. If Si
equals -.2 or less corrosion or irritation may occur.