I have lots of experience with the gov surplus units from Ebay. I buy them because you get a brand new unit and if you do a mild clean of the membrane with biocide it works just fine. I attach the new pump and membrane section to my old
motor assembly. I get about 2 years of
service in
Catalina Harbor before the membrane fouls. My pre filtering is 20mc and 10mc and I have the unit set up on auto run with a ACR
battery combiner. I am currently getting 78ppm due to winter cool & clear
water. Not bad considering my replacement for these units are around 200.00 ship inc. I suggest you try and test the output before you invest in
parts.
Good luck
captbruce