Face - I am not sure you understand indusdtrial vacuum systems but its cute that you are trying. The flooding occurred when a dipshit plumber attached a recirculating pump accidentally to my backflush lines.
I do actually, as you may remember that my entire family are tradesmen. I've seen a couple of these in mechanics shops. While clearly almost no common vac is useful in a shop, there are certain advantages to a nice wet/dry over the in-wall because of the relative ease with which the whole system can go down. My attempts at connecting this with domestic versions were at once an attempt to show my spite towards in home systems, my love of electrolux and to potentially send you into a tizzy. Sadly, despite what reaction I did get, it does not appear the third bit was successful. Feel free to go on bitching that you're plumber is unskilled when it comes to reading pipelines.