USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
20
Preparing Pool/Spa Water
Salt Chlorination
When used with an optional Hayward TurboCell and P-KIT, the OmniLogic can generate all the chlorine needs for pools up to 40,000 gallons (150,000 liters), or
the needs of most commercial pools up to 25,000 gallons (95,000 liters). If enabled (see Configuration Wizard), this operation requires a low concentration of
salt (sodium chloride) in the pool/spa water. The OmniLogic automatically converts salt into free chlorine which kills bacteria and algae in the pool/spa. Chlorine
will revert back to sodium chloride after killing bacteria. These reactions will continuously recycle, virtually eliminating the need to add sanitizing chemicals
to your pool/spa. The only time you may need to add more salt to the pool/spa is when water is replenished due to backwashing, draining, or splashing (not
evaporation). The actual amount of chlorination required to properly sanitize a pool varies due to bather load, rainfall, temperature, and the pool’s cleanliness.
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 Om-
niLogic 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.
Si = pH + Ti + Ci + Ai - TDS
Hardness
Calcium
75
100
125
150
200
250
300
400
600
800
Total Dissolved
Solids
Total
alkalinity
°C °F Ti Ci Ai TDS
12
16
19
24
29
34
39
53
60
66
76
84
94
102
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.4
2.5
75
100
125
150
200
250
300
400
600
800
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
2.9
0-1000
1001-2000
2001-3000
3001-4000
4001-5000
12.10
12.29
12.35
12.41
12.44
Use: Measure the pH of the pool water, the temperature, water hardness, total alkalinity,
and total dissolved solids. Use the table above to determine Ti, Ci, Ai, and TDS in the
formula shown above. If the Si is equal to 0.2 or more, stains may appear. If the Si is
equal to -0.2 or less, corrosion or deterioration may occur.
Corrosion Stain
Ok
-0.2 0.2
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