A standard 40-pound bag of residential water softener salt typically costs between $6 and $12, depending on the type of salt and where you purchase it. Standard rock salt is the most affordable option (around $6 to $8 per bag), while high-purity evaporated salt pellets or specialized iron-removal salt cost slightly more ($9 to $13 per bag) because they prevent mushing and keep resin beds cleaner. For a typical household consuming two bags a month, monthly salt expenses average around $15 to $25. Verification: Check local hardware store pricing to compare bulk pallet rates versus individual bag costs.
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