i'm a cheater though i do resent the label lazy as that i certainly am not.
if you vac properly they say that gets rid of 80% of the dry soil in the carpet that leaves 20% to account for, how much of that is on the surface and how much is deep deep down in the carpet?, we don't really know.
what i do know is i have been using my dry fusion machine for over three years and it leaves the carpets clean enough for me to get paid and i have a lot of repeat custom so it can't be that bad. thats good enough for me.
I don't really care what anyone else uses as its none of my business but i would advise any new starter to try hwe and some form of lm system before deciding where to invest their hard earned . there is no right or wrong way its what suits the individual.
if you put 10 ltrs of water in your machine you will not get 10 ltrs out of the waste tank so it must follow that if you use water to lift the soil out of a carpet whatever water you leave in the carpet must also be holding a part of the
soil too.