Prospector its' called a Spectra Pure Eliminator RO system ( ours is 100 gpd) and here's a photo. As you can see there are three lines coming from it.....one for good water, one for bad water and one that screws onto your faucet or garden hose. We paid approx $150 for it but I'm sure you can do better on E-bay. We Hounds don't do ebay....had a bad experience with them and refuse to deal with their issues.

Ps....We start with well water that is approximately 120 ppm but will NOT BUDGE AN INCH on ph which is why we ended up using RO water in the first place......we could not control our hydro ph with standard well water.

We change the filters every six months and protect the filters from light (algae) and that's it. Oh.....and you need place to drain off the "excess" unusable part of the system and a to keep your "good water" in and you should be good to go.