Anybody know how to plumb a reverse osmosis system?

Question

I've got an old system that I'm trying to bring back to life, but the tubing doesn't make any sense. It goes from the sediment filter to the reverse osmosis element, then splits into clean and unfiltered streams. This is where it gets weird. The two streams go to opposite sides of a PVC assembly. One part looks like it's just a screen inside of a 3/4" PVC connector assembly, and the other side enters a 3/4" tee that seems to contain a flow restrictor of some sort. The rest of that stream branches off to the carbon filter, and maybe to the 5 gal tank. The last part of the PVC tee goes to an unknown exit. But why drain filtered water? Meanwhile, the carbon filtered water seems to be unattached to anything on the output. So which is the clean water? The carbon filter exit or the R/O output that seems to rejoin with the unfiltered water????? What is that restrictor tee? What is it for? How does it keep the clean water seperate from the drain water???

Unfortunately, the company that made it has an unreadable logo. Could be RWC or KWC, and it's a 'model 51 Integrated Reverse Osmosis' system, s/n 80142.

Thanks for any light you can shed.

It's an under-sink system designed for use with a municipal water supply.

Answer 1

Not sure if this will help but it's all I could find. Good luck...
http://www.unce.unr.edu/publications/FS05/FS0510.pdf

Answer 2

i would try any company that deals with R/O it wont be the same but the principle is there with out seeing the unit in real life it would be hard to get all the lines strait possible but hard but after reading it you dont mention a pump for supplying the fineshed product or what PSI is involved or what you plan on using the system for carbon filter I assume would be for consumption but assumption is the mother of all *uck ups