11. I have witnessed a test with an appliance (electric gravity purifier) and it changed the color of the tap water and another filtered water, not of their own filter, which is reverse osmosis? Is this proof that my water is not clean while theirs is?

Salespeople using electrical gravity devices or water gravity appliances are a typical example of consumer deception, with the help of statements about what the test shows and what it does not show.  The test only shows the levels of salts or inorganic substances of water hardness and provides no information about quality or the presence of possible contaminants dangerous for health.