I'll give you a hundred for it
This may sound a bit corny , But i don't think Prochem does anything by halves to be honest.
after looking into it i still like HWE more but everything has its place.
I tried out some envirodri stuff which i think is similar (Not certain) don't like the fact you are adding this solvent powder stuff to the floor , you must have to be extremley dedicated to get it all back out of something with a deep pile.
Some of the sponges i have heard (probably on here )are good for flood work though.
Has your thingy got contra rotating brushes on it ?
How will you get the sponge back out? with a sebo ?