We had a visit by a saleswoman who was trying to sell us a $2,000 "Rainbow cleaning system". For just listening, we received a gift of some bed sheet and also a "gift travel certificate" from a company called "Certs, Inc". (which is a florida based travel gifts company that does not make me very excited)
What this thing is, it seems, is a 25k RPM impeller sitting on top of a Lexan bowl filled with water. The impeller sucks air in, makes it whirl in a way that it makes contact with water and sheds the dust and other stuff into water.
There is no filter, like on conventional vacuums that trap particles into a filter. Water acts as a filter.
The machine was supposedly "1.9 HP", however, when measured with my Kill-A-Watt power meter, it registered only 850 watts consumed from the wall outlet, so it could not be more than 1 HP. OK, we all know that everyone is lying about HP these days. No biggie. If it was 1.9 HP, it would trip the breakers all the time.
As a side comment, what we have now is a Sears Kenmore upright vacuum that is a real beast, it uses about 13 amps and has a HEPA filter.
Then the saleswoman proceeded to make various points, which I may not remember all or in correct order, but I will mention a few.
1. Vacuum cleaners do not pick up sand from carpets/rugs, well. No comment on my part.
2. After just 15 minutes of use, due to dust getting into the fine mesh of the vacuum's filter, the "air flow" diminishes due to dust blocking the little pores. So a vacuum cleaner is not usable.
This was a total lie, as was easy to demonstrate with my vacuum which has its bag 2/3 full already. It still sucked well and produced a lot of suction and air flow.
3. Vacuums blow dust around and increase amount of dust.
I cannot say that it is false, for sure, but the 2.3 full bag in our vacuum attests that it traps at least some dust. Plus, it does have a HEPA filter.
She did some acrobatics by taking out the HEPA filter, which had some dust on the back, kind of mashed it in her hands a little and put back, -- then when the vacuum turned on, a lot of dust was indeed blown out.
4. Then there were some demonstrations that Rainbow would still pick up dust after vacuuming with a Sears vacuum, which could possibly be true but I think that she cheated a bit by going outside the area that I actually vacuumed, a bit -- it is kind of hard to tell, I think so but my spouse is not so sure.
5. She made some claims about infections that her system prevented, which went somewhat over my head but overall I was not sure if it was not complete bunk.
We did not purchase this system in the end, but I wanted to hear some opinions on this stuff.