Actually, rock salt and crystal salt are different with rock salt being a lower quality--RE: dirtier. I would never use rock salt unless an emergency and only enough to hold you off till you get better salt.
It may also depend on the softener. Most standard softeners use hard, iron-laden water in the brine drum so the quality of the salt isn't as essential. But if your softener uses treated water in the brine such as with twin tank or some high quality single-tank systems, then use pellet or cube salt only.
Are you currently using a softener or making plans?





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