Some water packaging company think that clean water is all about adding chlorine to water, but it goes beyond that, there are many tests that water should pass before you call it clean. Some of them even contaminate the water the more. I always laugh at some people who like to take table water and think that it purer than sachet water, but most times they don't know that the content is the same while it's only the containers that make the difference. Thanks @ugonma for this expository post