OK, must have forgotten to "knock on wood" or something, because today for the first time ever, as irony would have it after my previous post, I had a separation in one of the MP40 Wet/Dry side assemblies! I did raise the flow rate slightly, before the two pieces split. Also, both of the pumps had significant algae growth which I cleaned immediately following the split. there was a noticeable increase in flow, following the cleaning. Hypothesis, keep the wet side assembly clear of algae and general gunk for efficiency and reliabilities sake.