# Swimming Pool Water Balance Equations Formulas Calculator

## Maintenance Hot Tub Pool Wading

Below are two methods to solve for the Langelier Saturation Index. Method 1 automatically calculates the various factors (temperature, hardness and alkalinity). For method 2, the user will need to manually look up the values from the table and place the values into the calculator.

Method #1
Solving for Langelier Saturation Index.

Method #2
Solving for Langelier Saturation Index.

 Water Temperature (°F) Temperature Factor (TF) CaCO3 PPM Calcium Hardness (CF) Total Alkalinity PPM CaCO3 Alkalinity Factor (AF) 32 0.0 5 0.3 2 0.7 37 0.1 25 1.0 25 1.4 46 0.2 50 1.3 50 1.7 53 0.3 75 1.5 75 1.9 60 0.4 100 1.6 100 2.0 66 0.5 150 1.8 150 2.2 76 0.6 200 1.9 200 2.3 84 0.7 300 2.1 300 2.5 94 0.8 400 2.1 400 2.6 105 0.9 800 2.5 800 2.9 128 1.0 1000 2.6 1000 3.0

 Langelier Saturation Index (SI) Condition -0.5 < SI <0.5 balanced > 0.5 scale forming over saturated < 0.5 corrosive under saturated

Inputs:
 pH
 temperature factor (TF)
 calcium hardness factor (CF)
 alkalinity factor (AF)

Conversions:
 pH= 0 = 0
 temperature factor (TF)= 0 = 0
 calcium hardness factor (CF)= 0 = 0
 alkalinity factor (AF)= 0 = 0

Solution:
 Langelier Saturation Index (SI)= NOT CALCULATED

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Select to solve for a different unknown
 Langelier Saturation Index pH (test kit) temperature factor calcium hardness factor alkalinity factor

 turnover rate or time pool volume or size pump flow rate

References - Books:
Haan, William D. and Johanningsmeier, Julie S. Swimming Pool Pest Management: A Training Manual for Commercial Pesticide Applicators and Swimming Pool Operators. Kent County Health Department and Michigan State University. Unknown date.

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By Jimmy Raymond

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