In most cases you can just buy universal pressure vessels. You can just buy another similar size unit or even different size units, which may effect how much water
you make.. No big deal.
-You don't have to have the manufacturers ones.
-Find out if you can turn the pump by hand to ensure it's not seized.
-Is there a way to flush it with fresh water
? plugs? ports
-Your pressure vessels may be fine, might not.
- Remove the membrane from the pressure vessels and you will be able to determine condition of the end caps etc of the vessels. Often they just have Orings which you can buy. A standard Buna N oring will work way above watermaking pressures. I've used them as high as 8000 psi in industry.
-The membrane (s) are shot. So either find ones to fit your vessel or get both.
- I rebuilt a 120V system on my catamaran
. It had three 24" pressure vessels and some of the end caps were corroded and bad etc. For cost savings I just bought one long pressure vessel and membrane instead. It down rated my system to something like 20 gallons an hour but that was more than I needed anyway. No big deal, just plumbing
-I also eliminated the "automatic sensing/testing system" as it was always problematic according to the previous owner.
My unit worked great when done.