I was wondering what is the norm for a RO/DI setup? the reason I am asking is my lfs wants 189.00 bucks for one and home depot has one for 79.00 it is a ro system for drinking water would something like this work ? also if someone who knows ro/di explain how this works and single stage etc.. I would appreciate that please I got a bad 8 gal of ro from lfs and looking to get my own!!! :strooper: