USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
4
Preparing Pool/Spa Water
General Water Chemistry
Salt is required only if you are using the chlorinator features on the OmniLogic Control Center. If you are NOT using the chlorinator, it is recommended that
you follow all of the other chemistry recommendations besides salt.
Water Chemistry
This table summarizes the levels that are recommended by the Association of Pool and Spa Professionals (APSP). The only special requirements for the
OmniLogic are the salt level and stabilizer.
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 ±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.
The pool’s chemistry must be balanced BEFORE activating the OmniLogic’s optional chlorinator function. NOTE: If the pool does not have new water, add
metal remover and non-copper based algaecide to the pool, per manufacturer’s instructions. This ensures a quick, troublefree transfer to the OmniLogic
system.
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
