Now, look at the bag closely. Some salts have rust inhibitors or cleaning agents. They sound helpful, right?
Well, they can be. If your iron levels are high (like, orange-stained-toilets high), a salt with a rust inhibitor is smart. But for most of us, it’s overkill.
And those cleaning agents? They can sometimes make a mess in softer water. When in doubt, buy plain evaporated salt pellets without additives. Your softener is a minimalist; it likes simple things.