The salt is used to clean the resin beads during a regeneration cycle, allowing the system to continually remove hardness from your water supply. Here's a breakdown of how the water softening process works: Hard water enters your home from a main water pipe or well, and travels to the water softener.
How can I fix my water softener?
Five Steps for Keeping Your Softener Healthy
Use pure salt with iron remover.
Don't add salt until almost all the salt in the tank is used up.
Use Iron-Out once a year to clean the resin bed and the parts in the control valve.