Pentair CFIGGEN20 - Page 7

5
Cyanuric acid in the form of cyanurate ions which contributes to alkalinity.
Thus, a correction must be made to total alkalinity. We subtract 1/3 of the
cyanuric acid level from the reading obtained in the total alkalinity test.
Total Alkalinity - 1/3 Cyanuric Acid = Corrected Alkalinity
This correction can be considerable in established pools with high cyanuric
acid levels; for example, at 100 ppm cyanuric acid, the correction amounts
to 33 ppm (100/3 = 33.3).
℃
℉
T
i
Calcium
Hardness
Ci
Total
Alkalinit
y
Ai
12
53
0.3
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
0.4
19
66
0.5
24
76
0.6
29
84
0.7
34
94
0.8
39
10
3
0.9
Note: Use the reading on the chart that is most applicable.
Total alkalinity in this context refers to the total amount of carbonate and
bicarbonate alkalinity. If cyanuric acid is used, a correction factor must be
used when determining.