Drinking Water
Water softener size calculator
Uses OpenStats municipal hardness with a 75 gallon per person daily estimate.
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Formula: grains per day = people × 75 × (hardness mg/L ÷ 17.1). Rated capacity targets one regeneration about every seven days with roughly 75% of resin capacity in use. Without JavaScript, the default below assumes 4 people and 250 mg/L.
- Grains per day
- 3351
- Sized capacity
- 32,000 grain
4 people × 75 gal × 11.2 gpg
About 7-day regeneration at 75% usable resin
OpenStats tier: 30,000 to 32,000 grain class
Matched pick: Fleck 5600SXT 32,000 grain for Calgary, AB at 191 mg/L.
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