Read your thread.it was interesting, lots seem to like aquarium water, except this one. But I'll throw something to you.

Am certified water handling specialist, had to pass state tests for the honor. Ran rural water district for 20 years. You people really don't want to know. Filter all your trap water before eating or drinking, drink distilled water if possible. Your bought water is about the money!!! Their regulations look fine, but spend some time in the field, scary. Think Pauly Shore as your water boy, or -!#= even me. Bottom line treat the things you love, special.

Living rain water, works very well for me, and they are goldfish, snails,2 bullheads, and algae in a 700 gal , use an inch of the bottom every couple of days.