I must say this is one awsome rig. The thing weighs a ton. Afraid its gonna rip the screw out of the wall. Anyways, had it up and running in about 10 minutes. Geez, didn't even give me enough time to drink one beer. Water pressure is sitting right around 42 psi and TDS in is around 100, RO is 5, and RO/DI is 0. I am still trying to figure out all the valves. Anyone that has one what exactly is the DI bypass for. AND DON'T SAY TO BYPASS THE DI. When I open the RO only valve I have to close the water coming out the DI unit to get the water to come out the RO only valve. The DI bypass valve doesn't seem to have any effect? Some help me out here. When you want to shut the water off, is it better to shut off the supply line or just close the line coming out of the DI canister and let the auto-shutoff valve shut things down? Thanks for any help. Also I read on here somewhere that somebody was talking about how the service at AIRWATERICE wasn't that good anymore. I have no idea where they got that from. When I got mine, the top of the DI canister was loose and came to find out that the screws would not tighten up. One email to airwaterice and they had new parts on the way at no charge. AMAZING SERVICE. Just didn't want that other post scaring anyone.