The TRUTH About Vacuums #8
A lot of door-to-door water filtration vacuums have been sold over the years on the premise that all dirt picked up will be trapped in the water - that has to be right, right? WRONG! But how can dirt get out of water? Well, if the dirt is non-wettable or semi-wettable, it won't readily dissolve in water, and since that was the only "filter" those vacs had, these finer particles would either blow out into your house or, since it was damp, get stuck in or around the vacuum motor. (Some dirt does stay in the water, though, and since you see it right away, you're very impressed). Ironically, if you have sinus or lung problems, this is the very dirt that is most irritating to you. Examples of these particles include : Ash, soot, smoke (smoke is a particle, & almost ALL of it goes right through water - just ask your local bong or hookah salesman), instant cocoa mix (you ever battle with trying to get that stuff to dissolve readily in your cup? It's semi-wettable!), POLLEN, ...
P.S. : For years these vac manufacturers have stood by there convictions about water's filtering abilities, but their new water filtration machines have a SECOND, NON-WATER filter to catch what gets through the water. So, what does that tell you?