Over the past little while I've been reading lots of threads on RODI selection questions and seen some responses here and there about some who have insanely high and insanely low TDS and pressure coming from there tap. And it really got me wondering how wide of a range there really is out there. So I'm going to throw it out there and hopefully get some good info on various locations stats and how reefers overcome them. So where are you? Where are you getting your water from and what kind of TDS and/or PSI are you tackling? What system do you use to do it? Anything you want to change about it? For me I have 240 TDS and 85psi coming from the street here in Calgary. 90GPD 4 stage Spectrapure with a BRS water saver upgrade kit (plumbed in series) and 3 stage TDS meter, gets me 1-2 TDS after the Dual RO filters and 0 after single DI. I love my system and the only thing I'd add is another DI stage, toyed with the idea of adding another RO stage just to see what it would do.