22
Chlorinator Operation / Pool Chemistry
The table below summarizes the levels that are recommended by the National Spa and Pool Institute
(NSPI). The only special requirements for the Aqua Logic are the salt level and stabilizer. It is important
to maintain these levels in order to prevent corrosion or scaling and to ensure maximum enjoyment of the
pool. Test your water periodically. Your Authorized Aqua Dealer or most pool stores can provide you
with the chemicals and procedures to adjust the water chemistry. Be sure to tell the pool store that you are
using an Aqua Logic chlorine generator.
Saturation index
The saturation index (Si) relates to the calcium and alkalinity in the water and is an indicator of the pool
water “balance”. Your water is properly balanced if the Si is 0 ±.2. If the Si is below -0.2, the water is
corrosive and plaster pool walls will be dissolved into the water. If the Si is above +0.2, scaling and
staining will occur. Use the chart below to determine the saturation index.
ºC ºF
Ti
Calcuim
Hardness
Ci
Total
Alkalinity
Ai
53
60
66
76
84
94
103
12
16
19
24
29
34
39
.3
.4
.5
.6
.7
.8
.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.
Si = pH + Ti + Ci + Ai - 12.1
-.2
0
.2
CORROSIVE
SCALING
75
75
100
100
125
125
150
150
200
200
250
250
300
300
400
400
600
600
800
800
1.5
1.9
1.6
2.0
1.7
2.1
1.8
2.2
1.9
2.3
2.0
2.4
2.1
2.5
2.2
2.6
2.4
2.8
2.5
2.9
OK
