Blueworks BLH Series - Water Chemistry Management; Ideal Chemical Levels; Saturation Index Explanation

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IDEAL CHEMICAL LEVELS
Salt
3000 to 4000 ppm
Free chlorine
1.0 to 3.0 ppm
pH
7.2 to 7.6
Cyanuric Acid
(Stabilizer)
50 to 100 ppm
Total Alkalinity
80 to 120 ppm
Calcium Hardness
200 to 400 ppm
Metals
0 ppm
Saturation Index
-.2 to .2
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.