Water Treatment Answers is a free service that connects homeowners with local water treatment and filtration companies. We are not a water-treatment company or installer, and we do not perform the work ourselves.
A rule-of-thumb estimate: daily grains equal people times about 80 gallons per person per day (a typical U.S. figure of 80–100, USGS) times your hardness, sized to regenerate about weekly. Grains per gallon equal milligrams per liter divided by 17.1. Use your water test or utility report for the real hardness. This is educational, not a quote.
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