I remember a couple years ago there were people trying to push interest in Kirby, then went to Ebay and found an unusual amount of Kirbys for sale for less than a $100.
Guess what. Just checked Ebay and there is an unusual number of Rainbows for less than $100
hmmmm.
It's been pointed out about the lack of suction but also, it's really not practical to fill and empty a vacuum with water after each use and if you should happen to tip the unit.......eww, yeah. That's a real mess and could end up with a user getting electrocuted. Also, if mold were able to grow inside the machine between uses, when you go to use the unit, it would blow those mold spores all over the room.
Tests have shown that water is not the magical trap it would seem to be. Particle exhaust tests have shown these vacs as having a high particle count escaping and entering the room.
Really, for the money one of these cost new one could afford a decent, vented, top fill central vacuum system and not have to worry about recirculating dust, noise, a heavy canister that could tip, and it would actually INCREASE the value of ones home.
One last thing, the last week or so I've seen an ad appearing on Youtube about the Quantum X upright vacuum that uses a water based dust bin. They compare it to the Rainbow and state that it's quite easy to use and cost 1/4 what the Rainbow is apparently selling for new. Have you seen that? Here's their website and if you do a search on Youtube you can find their commercials.
https://www.quantumxvac.com/
