building first RO

[jake1]

If you want bigger than 3/4 Hp you gotta go 56c bolt on with love joy couple instead of the clamp on

[sgariety]

So I am using the 3/4 motor right now but will upgrade it soon to a 1.5hp. My next question is tubing and hoses. What does everyone use? I was thinking I could just use pex but A, it is too stiff to work with easily and B, it is only rated for 160psi. I believe I want to run around 200psi coming out of the HP pump and through the membrane house through discharge.

[jake1]

I'm pretty sure you wont be able to hit 200psi with that motor. But maybe. As for tubing i used the clear PVC with braided nylon in it, rated to 250psi i believe. Its cheap and available. Then some stainless fittings with brass barb fittings to tubing hose clamped. I am happy with it and have had no trouble accept my end caps leak slightly so I switching to copper just on the top of the endcaps so I can use a coupler union and tighten if need be. As is i have a 90 coming out of the endcap so there's no way to tighten or it throws off the indexing. If I could do it over i may just sweat copper for the whole thing. I spent way too much on brass and stainless fittings. Also I. Looking for advice on a good thread sealant for endcaps. IV tried lots but can get one to stop weeping. Maybe the copper trick will help. Anyone used leaklock on endcaps with any luck?

[Clinkis]

I’ve found copper works well for plumbing. Relatively cheap and easy to design and build. Had no issues going to 300 psi. For thread sealer the best thing I’ve found is a little bit of pipe dope, a few wraps of Teflon tape and a little more pipe dope on top. I use that for all my threaded fittings now, copper, stainless and plastic. Have never had one leak.