Mike I'm on Duteau creek. I just took measurements this morning and I'm getting 79 source tds. During my attempts to fix the original problem, I got a new RO membrane installed and now get a reading of 1 after the RO. I still put it through my DI since 0 sounds good to me.

Cool, that sounds about right with the RO output now. I tap off the RO for drinking water, making beer & fizzy pop. DI is used only for making up fresh tank water & top off.

Also ,after seeing some lab results from various sources of B.C waters,you guys are high in tannins,your tds meter wont pick that out only conductive mineral salts.thats why I tend to see high bio fouling on commercial size membranes(10GPM).Great TDS but poor production.