I should be reading up on this, may be this was answered already, a quick search didn't find anything. Right now, I would really appreciate a quick answer. I have soft water only, still citric acid in my recipes made a significant difference in terms of scum in my bath tub and sinks. I know that salt is a water softener so, I'm not really sure if the salt bar needs a chelator. I used it in my previous batches, but really don't want to be wasting resources, esp the lye. So, let me know what do you do or what will you suggest I do. TIA for your replies.