I've been using an inland sea mineral liquid, low sodium, high in mg. to my water for years. I love the taste. Even though I have an exceptional well. I'm planning on buying a distiller, remove all minerals and start fresh with a balanced source. Most waters are mostly ca. and low in mg., and of course low in most trace mins, to say the least about having any natural balance to them. When I say natural, I mean that it would come close to resembling the mins in the ocean. I've recently found Blue Ocean Minerals, which like the aforementioned product, somehow includes ca. Usually when they precipitate out sodium, Ca. also drops out. But Blue Ocean has a different process where the ratio of mg. to ca. is 3/1. I'll let you know how this works. To test the idea I bought one of those pour through water filters that removes everything, and then added the sea mins to that. I loved that taste, far better than adding them to my well water. But, when I went to change the filter and open the old one up, and looked at all the man made little plastic looking beads that collected the impurities and mins from the water, I thought there's no way I'm going to trust that that is not going to leach into my water. The method of testing the water I believe is from a conductivity test,,, plastic I don't think will show up on the test meter.