News flash:
A salt is the product of any two ions reacting. Since most things that will dissovle naturally in tap water are ions . . . get ready for it . . . theres more then one salt involved.
Specifically there are salts of carbonate, sodium, chorine, calcium, copper, iron, sulfer, florine, iodine, lead, bromine, etc. Did I mention nitrates, phosphates and sulfates? Do a google search, you'll find a few dozen more things. Basically if its solable at all, exists in nature and is stable in water, theres some of it in tap water.
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