I have a Hydramaster TM, low moisture system and use an Envirodry for agitation and dry cleaning, I was not a great fan of the dry cleaning system, but used in conjunction with the Gen 4, good results are delivered, although the micro sponge cost does make the process more expensive than I would like. If you agitate the sponges in with a basic machine like a duo, the results will be poor imo.
Regards
S