Newbie Ro water question

[4lti7ude]

Originally Posted by Madreefer

Reverse osmosis is often used in commercial and residential water filtration.

Not trying to hijack but I was just wondering; if reverse osmosis is used in residential use then why do people do this themselves?

For all my tanks water changes I dont use anything, I just mix a little bit of hot and cold water and then top off. No algae problems at all yet.