22
REFERENCE SECTION
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
Corrosive to
metals, etches
plaster finishes,
and irritates
skin
Scaling, staining,
and cloudy water
conditions
Ok
Examples:
pH = 7.2 .....................................:
Water Temperature = 84 F .............:
Calcium Hardness = 150 ppm ........:
Total Alkalinity = 250 ppm ..............:
Salt Level = 1 - 1000 ppm ...................:
pH = 7.8 .....................................:
Water Temperature = 84 F..............:
Calcium Hardness = 200 ppm ..........:
Total Alkalinity = 250 ppm ..............:
Salt Level = 1 -1000 ppm ...................:
pH = 7.2
TF = 0.7
CF = 1.8
AF = 2.4
SC = 12.1
7.2 + 0.7 + 1.8 + 2.4 – 12.1 = 0
(Water is perfectly balanced)
Water Test Results #1
7.8 + 0.7 + 1.9 + 2.4 - 12.1 = 0.7
(Water is scale forming)
pH = 7.8
TF = 0.7
CF = 1.9
AF = 2.4
SC = 12.1
TF
Calcium
Hardness
CF
Total
Alkalinity
AF
60 F
15.6C
0.4
150 ppm
1.8
75 ppm
1.9
66 F
18.9C
0.5
200 ppm
1.9
100 ppm
2.0
76 F
24.4C
0.6
250 ppm
2.0
125 ppm
2.1
84 F
28.9C
0.7
300 ppm
2.1
150 ppm
2.2
Salt Level
SC
94 F
34.4C
0.8
400 ppm
2.2
200 ppm
2.3
0 - 1000 ppm
12.1
103 F
39.4C
0.9
600 ppm
2.4
250 ppm
2.4
1001 - 2000 ppm
12.2
Temperature
Saturation Index (SI) - E4aqua:
The Saturation Index is a formula used to predict the calcium carbonate saturation of water, that is, whether
your water will precipitate, dissolve, or be in equilibrium with calcium carbonate.
Water is properly balanced if the SI is 0 ± 0.3. If SI is greater than 0.3, scaling and staining will occur.
If SI is less than -0.3, then the water is corrosive to metallic fixtures and aggressive to plaster surfaces
and vinyl liners.
A high or low SI can cause premature damage to the cell, equipment or pool finish. As a general rule,
higher concentrations of calcium, total dissolved solids, pH, and alkalinity all promote a greater tendency
for scale. Scaling potential also increases with increasing temperature.
pH + TF + CF + AF - SC = SI
Use the chart below to determine your overall water balance. Test water for pH, water temperature, Calcium
Hardness, Total Alkalinity, Salt Level, and use the equivalent Factors (TF, CF, AF, Constant) from the
chart below to determine your Saturation Index. Adjust chemicals to maintain balanced water.
Note: The E4aqua additive package utilized with the AG will operate at the higher end of the alkalinity
range, as well as the lower end of the salinity range. Be careful to maintain the pH close to 7.2 with sodium
bisulfate pH reducers to keep the SI in an acceptable range.
Water Test Results #2
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