A standard residential water softener should generally not go longer than 7 to 14 days without regeneration, even if your household uses very little water during that period. If a softener sits stagnant without regenerating for weeks, the standing water and salt inside the brine tank create a breeding ground for bacterial slime, mold, and foul odors. Furthermore, if the resin bed goes unwashed for too long, iron and mineral sediment can permanently foul the plastic beads, destroying their ion-exchange capacity. Verification: Program your digital control valve to include a calendar override setting that forces regeneration every 7 to 10 days.
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