Cashcroppin, you say you suspect your pre-filter plugs up and ruins your Procon pump. A question, do you have a pressure gauge and flow meters on your homemade RO? iIf yes, adjust the pressure as it climbs higher than design pressure by opening your restriction valve. Also, flush off or change the prefilter sooner.
Even on a manufactured RO the operator needs to keep an eye on such things. If you don't have both a high pressure gauge and flow meters, get some and add them. Your Procon failures will not be there when you keep track and adjust as needed.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.