The frequency of adding salt to a home water softener depends on the size of the softener, the water hardness, and water usage. Generally, it's advisable to check the salt level at least once a month. If the salt level is noticeably low or has nearly dissolved, it's time to add more salt. For average households, this may mean refilling the salt tank every 2-3 months. In areas with extremely hard water, more frequent refilling may be necessary. Regular monitoring ensures the water softener functions optimally, preventing the buildup of mineral deposits in pipes and appliances.