Preparing General Water Chemistry - Hayward Pro Logic® Installation Manual

General Water Chemistry
Salt is required only if you are using the chlorinator features on the Pro Logic Control. If you are NOT using the
chlorinator, it is recommended that you follow all of the other chemistry recommendations besides salt. Refer to the
description of the Pro Logic configuration menu for information on enabling/disabling the chlorinator (see page 24).
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 Pro Logic 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 Pro Logic'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 Pro Logic system.
1. Preparing Pool/Spa Water
Si = pH + Ti + Ci + Ai - 12.1
ºC ºF Ti
Hardness
12 .3
53
16 .4
60
19 .5
66
24 .6
76
29 .7
84
34 .8
94
39 .9
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.
CORROSIVE
Total
Calcuim
Ci
Alkalinity
1.5
75 75
100 1.6 100
125 1.7 125
150 1.8 150
1.9
200 200
250 2.0 250
300 2.1 300
400 2.2 400
600 2.4 600
2.5
800 800
-.2
0 .2
SCALING
OK
3
Ai
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
2.9