you can use it on residential...... :roll:
I just wouldn't encap residential myself. However it's a good prescrubber for residential, just bulky and heavy.
Also I've been using mine to do VCT. Yesterday I cleaned a luxury vinyl floor (nafco type) with it, it did a wonderful job.
You should put down enough liquid as to see slight foaming on the carpet (as you encap of course) as you go, if you move fast then you can hold the trigger all the way down, if you're going over the carpet multiple times you probably only want the valve open slightly for the additional passes. As you get close to the wall it's a good idea to let off before meeting the wall. Then just before you start heading the other way make sure you open it again, there is a delay because the fluid is gravity fed and it has to flow through the pads. Really it's something that you just need to get out there and do, the only bad thing that can happen is that it will take longer for the carpet to dry.