153,004 sq ft will take you forever with a portable. Even if you have pump in / out capabilities, just moving that setup around sounds like a nightmare. If they must have HWE, something like the nobles strive might be your best bet, its a battery powered walk behind suck machine. I dont think they clean all that great, but then again, I dont think the portable will do that much better on commercial grade carpet IMO. If you can convince them on encap, a couple of cimex's would make such a large task digestible.
A side note on the Nobles strive... it does have a pretty aggressive brush on it, maybe use encap chemicals much like a crb? Of course you will also be picking up some of the chems with the inline wand. Maybe everybody gets what they want?
A side note on the Nobles strive... it does have a pretty aggressive brush on it, maybe use encap chemicals much like a crb? Of course you will also be picking up some of the chems with the inline wand. Maybe everybody gets what they want?