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That hydro unit sounds great. I get allergic reactions to dust, so it would be great for me to get rid of as much as possible of it.
I recently bought a new one, and ther seem to be 2 distinct "types" to consider [i can't really talk about "Brands", but i'm sure all major brands have both types], the one are the regular ones which just suck everything into a bag/filter and you clean this bag/filter afterwards. The 2nd type [which i bought now also] uses a water container , so it sucks everything into the water instead of a bag/filter. The biggest difference is much less dust with the hydro type unit, but the cleanup is a bit more messy . Overall my hydro unit seem to have alot more suction power or at least seem to grab onto dust much better , i think because the dust/particles really get stuck in the water where the normal units can be -extremely- dusty.
Having just recently bought a vacuum cleaner myself I will add a little here... I think again price makes all the difference when comparing units, not just the type they are. I saw some terrible water units at a low cost and likewise some terrible bag units in the same price range. The more expensive bag units usually have more than one filtration system so the chance of dust spewing out is minimal. There is usually the bag itself which filters the dirt out of the air, then that air passes through another two finer filters before exiting the exhaust pipe back into the air.
The problem with the water units is that you really need to pay a decent price to get a decent unit. I looked at some cheaply priced Electrolux water units and they were shockingly made. Size is another negative on the side of the water units. We wanted something that could easily be whipped out to suck up the odd little mess and some those bagged units are fairly compact (the three wheel easily manoeuvrable ones). Of course you also get the upright bagged units but again size is a negative in my eyes here.
There are effectively 4 types of units.
Bagless - where the dirt just goes into a holder which can be removed and cleaned.
Bagged - which have the bag which needs to be emptied. A plus is that the bag acts as a filter.
Upright units - the traditional ones where you push the handle to move the entire vacuum cleaner.
Water units - they use water as the filter.
Also OP test the suction power. The wattage is usually a decrent indicator but in my search I realised not all the wattage translates into sucking power.
So what unit did you end up with though?
As stated size and ease of manoeuvrability was the critical criteria for us as well as the fact that I was not willing to pay a fortune for a vacuum cleaner. We ended up going for a Samsung that was on special at Game.