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Title: Should have bought a piston pump??
Review: I have had the unit for 1 year now. I use it for weed and poison oak control with Roundup.The unit worked very well last time I used it, now it does not pump properly.I did leave some Roundup in it the last time I used it 2 months ago; normally I do clean it after use unless I plan to use again soon. In this age of plastic and synthetic I am quite surprised that the membrane can not take chemicals very well. The piston pump does not have a membrane so would probably do better.The membrane kit is $19.95 and very difficult in my opinion to replace; this indicates a poor design, meaning, It should be a simple thing to replace something that you know will have to be replaced.I bought a Stanley backpack sprayer, will report later on that one.
