How do I convert strip results to grains?

Divide mg/L as CaCO3 by 17.1 to get grains per gallon for softener math.

Test at the kitchen cold tap after 30 seconds of flow. Retest after seasonal source switches if your utility blends wells and surface water.

Drinking Water

Hardness test kits

Confirm mg/L before grain sizing.

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Municipal OpenStats pages publish plant averages. Strips close the gap between the report and your tap.

Fast mg/L style readout for sizing ion-exchange softeners.