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  AQUATIC ENVIRONMENTAL SYSTEMS, INC.
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Saturation Index Calculator home resources Common Calculations Saturation ind. calc

Saturation Index Factors

pH
TEST
pH FACTOR
PF
CALCIUM
HARDNESS
TEST
PPM
CALCIUM
FACTOR
CF
TOTAL
ALKALINITY
TEST
PPM
ALKALINITY
FACTOR
AF
TEMP.
F
TEMP.
FACTOR
TF
7.0 7.0 5 0.3 5 0.7 32 0
7.1 7.1 25 1 25 1.4 37 0.1
7.2 7.2 50 1.3 50 1.7 46 0.2
7.3 7.3 75 1.5 75 1.9 53 0.3
7.4 7.4 100 1.6 100 2 60 0.4
7.5 7.5 150 1.8 150 2.2 66 0.5
7.6 7.6 200 1.9 200 2.3 76 0.6
7.7 7.7 300 2.1 300 2.5 84 0.7
7.8 7.8 400 2.2 400 2.6 94 0.8
7.9 7.9 800 2.5 800 2.9 1.5 0.9
8.0 8.0 1000 2.6 1000 3 128 1

PF
pH
CF
CALC
AF
ALK
TF
TEMP
SATURATION INDEX

Saturation Explanation
If the result of this calculation is zero, the target goal, then the water is balanced. If the answer is less than 0, the water leans toward being corrosive. If it is greater than 0, then it is indicative of scale forming. An acceptable range is -0.3 to +0.3, with the optimum goal of 0 (zero). If the result is outside this range, adjustments should be made to the hardness, alkalinity and pH to bring it as close to zero as possible and ideally within the optimum ranges shown above. Be aware however, that while the water may be balanced from a corrosion and scaling point of view it does not necessarily mean that it is ideal for chemical efficiency and bather comfort.

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