Quote Originally Posted by rrasco View Post
There are different ones and it's really up to you. I have a dual inline and a handheld.

Water Source -> Pre-filter -> Carbon -> RO -> TDS #1 -> DI -> TDS #2 -> Purified Water

The handheld is to check your tap and whatever else you want. You don't 'need' any of these, but they certainly help.
Ok I found it on BFS page now I know what it is