Water Treatment

Alum Hydrometer Conversion

Convert hydrometer density readings and process temperature into corrected °Be, density at 60 °F, and estimated dry alum strength.

Enter observed conditions

Edit the two inputs to mirror the Excel workflow.

Dry alum strength
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Awaiting inputs

Enter the density reported by the hydrometer in g/cm^3.

The solution temperature when the hydrometer reading was recorded.

These are the only cells that move in the spreadsheet—everything else updates automatically.

Corrected hydrometer outputs

Values mirror the conversion polynomials captured in the original Excel tool.

Temperature conversion

Temperature (°F)
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°Be correction
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Hydrometer

Equivalent °Be @ 60 °F
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Corrected °Be
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Corrected density (g/cm3)
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Dry alum strength

Dry alum (%)
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Minimum percent available: 46.6%

Reference table

These density to deg Be to % solids triplets underpin the conversion curves.

Density (g/cm3) °Be @ 60 °F Dry alum (%)
Loading reference values...