A standard 40-pound bag of water softener salt typically lasts between 2 to 4 weeks for an average family of four residing in an area with moderate water hardness. However, exact duration varies significantly depending on your household's daily water consumption volume, your incoming water hardness rating measured in grains per gallon, and how frequently your system's digital meter triggers regeneration cycles. Large households doing frequent laundry loads or homes with very hard water may consume a 40-pound bag in under two weeks. Verification: Check your brine tank salt level weekly to track your household's specific consumption rate over time.
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