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Pool LSI Calculator

Langelier index plus distance from balanced. Inside -0.3 to +0.3 is safe; below corrodes, above scales.

Inputs

Inputs and assumptions

Measured pH. Balanced LSI band is -0.3 to +0.3.

Temperature factor from a standard LSI chart.

Calcium factor from a standard LSI chart.

Alkalinity factor from a standard LSI chart.

Result

Distance from balanced
0.00
LSI
0.00
Sizing estimate from label inputs. Confirm gallons, flow, BTU, and efficiency from manuals before buying equipment.

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Borax in pounds and 4-lb boxes for 30-50 ppm borates, plus cost. Borates buffer pH but never replace chlorine.

Outputs: Borax (20 Mule Team) (lbs) · 4-lb boxes · Borax cost (USD)

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Calcium Hardness Calculator

Calcium chloride in ounces and pounds for plaster 200-275 ppm. Confirm LSI after dosing to avoid scale.

Outputs: Calcium chloride needed (oz) · Calcium chloride (lb)

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Guides

01 Water Balance Order: Adjust Alkalinity, pH, and Calcium Hardness

Related articles

01 Pool Chlorine Basics: Levels, Testing, and Safe Handling 02 Salt System Care: Testing, Adding Salt, and Cell Maintenance 03 Water Balance Order: Adjust Alkalinity, pH, and Calcium Hardness

Workspace

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