Used commercial RO set up. Pump motor is 3 phase but can be converted or use a phase converter. Membrane housing is 4"x84". Fittings are all in decent shape. Not sure on the overall usefullness of membranes. They had 90% life when system was removed for an upgrade. Been sitting wet. I just drained them so they didnt freeze. Lots of useful stuff on unit if your clever enough to build your own system. $500 OBO or trade for buckets, mainline, tubing, spouts, filter/bottler, tanks, etc. Let me know what you have. I can send pictures if requested.