If its well water , and the water is acidic , and you have copper pipes , you will get bluish stains in the sink , tub and toilet .

i've heard of boric acid?

I would have all the floors done in white concrete and acid stained for good looks, easy clean up and it will last long. 

The tub guy gave us a little bit of a hard time since all the acid would run down into the basement (no drain hooked up)— we created a makeshift funnel for the acid to funnel into a container so we could get the job done right.

Works well if installed properly.I had a property with pex and either because they were not crimped properly or for whatever reason, there would be a slow leak and the slightly acidic water (well) would eat away at the fittings, causing many leaks and replacements. 

I would acid wash it to clean it up and seal it with a low luster stone sealer.

AND, this is after she listed with another agent before who listed it for $30,000 more than it was worth (roughly 10%) and that hurt the price of her home too since we all know days on market is like acid to the price of a home.

After than we ended up doing the acid etching and painting. 

This is, almost by definition, characteristic of cultist behavior and demonstrates a lack of critical reasoning skills.There is also the blanket "uneducated" statement that gets tossed around when the "liberal" one fails the acid test.

Most of the ones I see really aren't any different one from the other.The acid is test is how well you were able to monetize the material you received and quickly.