Calcium Saturation Index Calculator

Formula

The formula to calculate the Calcium Saturation Index is:

\[ CSI = pH + TF + CF + AF - 12.1 \]

Where:

\(CSI\) is the Calcium Saturation Index
\(pH\) is the measure of acidity or alkalinity of the water
\(TF\) is the Temperature Factor
\(CF\) is the Calcium Hardness Factor
\(AF\) is the Alkalinity Factor

What is a Calcium Saturation Index?

The Calcium Saturation Index (CSI) is a measure used in water chemistry to determine the potential for calcium carbonate to precipitate or dissolve in water. It is calculated based on the water’s pH, temperature, calcium concentration, alkalinity, and total dissolved solids. A positive CSI indicates that the water is oversaturated with calcium carbonate and may cause scaling, while a negative CSI means the water is undersaturated and may lead to corrosion.

Example Calculation 1

Let's assume the following values:

pH = 7.5
Temperature Factor (TF) = 0.7
Calcium Hardness Factor (CF) = 2.5
Alkalinity Factor (AF) = 1.5

Using the formula:

\[ CSI = 7.5 + 0.7 + 2.5 + 1.5 - 12.1 = 7.5 + 0.7 + 2.5 + 1.5 - 12.1 \approx 0.1 \]

The Calcium Saturation Index is approximately 0.1.

Example Calculation 2

Let's assume the following values:

pH = 8.0
Temperature Factor (TF) = 1.0
Calcium Hardness Factor (CF) = 3.0
Alkalinity Factor (AF) = 2.0

Using the formula:

\[ CSI = 8.0 + 1.0 + 3.0 + 2.0 - 12.1 = 8.0 + 1.0 + 3.0 + 2.0 - 12.1 \approx 1.9 \]

The Calcium Saturation Index is approximately 1.9.