Yes, running completely out of salt in your water softener is bad for the system and will quickly result in hard water returning to your plumbing pipes. When a softener operates without salt, it cannot create the brine solution required during regeneration, meaning the resin bed remains uncharged and saturated with hard minerals. While running out of salt will not instantly destroy or break the physical mechanical equipment, it leaves your water heater, appliances, and plumbing vulnerable to hard water scale accumulation until salt is replenished and a manual regeneration is run. Verification: Check your brine tank weekly to ensure salt is always maintained above the water line.
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