How do I calculate how many grains I need in a water softener?

To determine the appropriate water softener size for your home, multiply the number of people in your home by the gallons of water they use each day (80 gallons per person is the average). Multiply that number by the grains of hardness in your water to figure out how many grains need to be removed each day.

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What does 30 000 grain water softener mean?

30,000-grain water softener means that it is theoretically capable of removing that many grains of hardness before it needs to regenerate. The hardness is the number of minerals that the water softener can take in before it needs to refresh and drain itself.