1. What is the Langelier Index?

The Langelier Index (LSI) 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 Langelier Index formula:

Where:

• \( pH \) — pH value of water (dimensionless)
• \( TF \) — Temperature factor
• \( CF \) — Calcium factor
• \( AF \) — Alkalinity factor

Explanation: The equation calculates the saturation level of calcium carbonate in water, helping predict scaling or corrosion tendencies.

3. Importance of Langelier Index Calculation

Details: The Langelier Index is crucial for water treatment, industrial water systems, and plumbing to prevent scale formation and 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 LSI value indicate?
A: A positive LSI indicates scaling tendency - water is supersaturated with calcium carbonate and may form scale.

Q2: What does a negative LSI value indicate?
A: A negative LSI indicates corrosive tendency - water is undersaturated and may dissolve calcium carbonate.

Q3: What is the ideal LSI value?
A: An LSI close to zero indicates water is in chemical balance, neither scaling nor corrosive.

Q4: Where is Langelier Index commonly used?
A: It's widely used in swimming pool maintenance, cooling tower water treatment, and industrial water systems.

Q5: How often should LSI be calculated?
A: Regular monitoring is recommended, especially when water chemistry changes or in critical applications.