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W W W W Water Chemistry ater Chemistry ater Chemistry ater Chemistry ater Chemistry
The table below summarizes the levels that are recommended by The Association
of Pool and Spa Professionals (APSP). It is important to maintain these levels in
order to prevent corrosion or scaling and to ensure maximum performance from
your Salt & Swim chlorine generator. Have your water tested or use pool water test
strips and refer to the Chemistry Quick Start Guide information on testing and
adjusting your pool's water chemistry. Your Authorized Salt & Swim Dealer or most
pool stores can provide you with the chemicals and procedures to adjust the water
chemistry as well.
Saturation index Saturation index
Saturation index Saturation index 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