Hayward SwimPure Plus Operation And Installation Manual page 5

Water Chemistry
The table below summarizes the levels that are recommended by The Association of
Pool and Spa Professionals (APSP). The only special requirements for the SwimPure
Plus 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 SwimPure Plus 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 SwimPure Plus 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.
Si = pH + Ti + Ci + Ai - 12.1
Calcuim
ºC ºF Ti
Hardness
12 .3
53
100
16 .4
60
125
150
.5
19
66
200
24 .6
76
250
300
29 .7
84
400
34 .8
94
600
.9 800
39
103
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.
-.2
CORROSIVE
Total
Ci
Alkalinity
1.5
75 75
1.6 100
1.7 125
1.8
150
1.9
200
2.0
250
2.1
300
2.2
400
2.4 600
2.5
800
0 .2
OK
2
Ai
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
2.9
SCALING