Finished installing a darkroom sink in the corner of basement that was about 20 feet from water supply lines or a sewage line. Here are my thoughts regarding and a few photos of this recently complete project:
1) Sink: Purchased a used 36"x72" darkroom sink from a guy though craigslist.org. The sink has a sheet metal base and a shallow ABS plastic tray for a sink. I had to cut a hole in one of the side panels to route the wastewater discharge and sump vent line though. The sink is only 34" high and I'm 6' 7" tall, so I built a 10" high platform to place the sink so that it is at a comfortable working height.
2) PEX Pipe: The pumping in my house is copper. I did not want to run copper plumbing to the sink for two reasons, 1) the darkroom and associated plumbing will more than likely be removed if I move from this house, and 2) I intended to plumb it myself and I wanted something time and cost efficient to install. I had to cut into and do some soldering to tie into the existing copper piping, but running the PEX to the darkroom sink was easy, fast, and relatively inexpensive. If you decide to go down this path, purchase one of the crimper sets. I purchase the Zurn crimper set and am satisfied with it.
3) Sink Sump System: Purchased a Flotec FP0S1800LTS Sink Sump System (http://www.flotecpump.com/pdf/FP0S18...talogPage.pdf). I think the system is OK. It works. I'm not impressed with the quality of the pump and float switch, but then I'm probably heavily biased by being a chemical process engineer and having experience with high quality pumps in the chemical manufacturing and nuclear industries. Consider installing unions and/or hose clamp type flex couplers to make removing and reconnecting the sump easier.
4) ABS DWV Pipe: This has been the standard construction material more many years. It works great, beats the old cast iron that I wrestled in my old funky houses. I cut my pipe with a power miter saw, it was awesome. Make sure that you slope the lines for drainage.
Here's the sump on the 10" high platform under the sink:
Here's the PEX plumbing to the faucets and the sump plumbing:
Here's a shot of the plumbing that was attached to the ceiling joists, the lines include a wastewater line, a sewage vent line from the sump, a cold water PEX line, and a hot water PEX line:
And, the money shot...