1. What is the Calcium Saturation Index?

The Calcium Saturation Index (CSI), also known as the Langelier Index, is a calculated number used to determine the calcium carbonate stability of water. It indicates whether water will precipitate, dissolve, or be in equilibrium with calcium carbonate.

2. How Does the Calculator Work?

The calculator uses the CSI formula:

Where:

• \( pH \) — The measured pH of the water
• \( TF \) — Temperature factor (based on water temperature)
• \( CF \) — Calcium factor (based on calcium hardness)
• \( AF \) — Alkalinity factor (based on total alkalinity)

Explanation: The equation helps predict whether water will form scale (positive CSI), be corrosive (negative CSI), or be balanced (CSI near zero).

3. Importance of CSI Calculation

Details: Accurate CSI calculation is crucial for water treatment, pool maintenance, and industrial applications to prevent scale formation or corrosion in pipes and equipment.

4. Using the Calculator

Tips: Enter pH value, temperature factor, calcium factor, and alkalinity factor. All values must be valid numerical inputs.

5. Frequently Asked Questions (FAQ)

Q1: What does a positive CSI value indicate?
A: A positive CSI indicates a tendency for calcium carbonate to precipitate, forming scale.

Q2: What does a negative CSI value indicate?
A: A negative CSI indicates corrosive water that can dissolve calcium carbonate and potentially damage pipes.

Q3: What is the ideal CSI range?
A: For most applications, a CSI between -0.3 and +0.3 is considered balanced water.

Q4: How often should CSI be measured?
A: In pool and industrial water systems, CSI should be measured regularly, typically weekly or when water conditions change.

Q5: Can CSI be adjusted?
A: Yes, CSI can be adjusted by changing pH, calcium hardness, total alkalinity, or water temperature.