Water Chemistry
The table below summarises the levels that are recommended. 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. Your Authorised Salt
& Swim Dealer or most pool stores can provide you with the chemicals and procedures to adjust the
water chemistry as well.
Note that pool water emanating from wells and municipal water supplies, along with the introduction
of environmental contaminants, can contain chemistries that are deleterious to the life expectancy
of the Cell.
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
8
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
