Water Quality and Hardness

These tools work from a water reading. Calculate total dissolved solids from conductivity, convert hardness between units, size a water softener from hardness and household size, or convert salinity, conductivity and specific gravity.

Tools in this group

• Salinity Calculator — Convert a conductivity, salinity or specific gravity reading of seawater or a reef tank into the other units at your water temperature.
• TDS Calculator (Total Dissolved Solids) — Calculate total dissolved solids from a conductivity reading or a water analysis, and compare the result with the 500 mg/L drinking water guideline.
• Water Hardness Chart and Converter — Enter a hardness in any unit to see it in all the others and its hardness class, or work it out from calcium and magnesium results.
• Water Softener Size Calculator — Enter the people in the home and your water hardness to get the grains removed per day and the smallest common softener size that covers them.