What you need the most is a circular system for putting down solution and then picking it up with vacuum. Have you ever seen a CFR uphol. tool used on a cushion? The solution is never let loose into the fabric. It is controlled by the vac power as it goes into the fabric, and then is quickly pulled back out of the fabric in a circular, power washing method.
A floor wand with angled jets and a
glide are imitating that circular action the best way possible. The solution is being sprayed THRU the carpet fiber and then being vac'd up asap by the glided wand. That is why high flow really works, because you are "flooding" the fiber with rinse solution in order to remove the emulsified dirt that is/was attached to the carpet.
You can use more PS if you trigger on with both your forward stroke and back stroke. The glide picks up PS as you go forward while you lay down a sheet of water and then picks up the rinse on the way back. If you flow 12 with the trigger always on you are rinsing with 24 flow on the backstroke but not dealing with as much dirt and PS because your forward stroke sucked a lot of it up.
The Zipper wand takes advantage of having two glides working in unison with the jets always spraying rinse solution between them.....no matter if you are going forward or back with the trigger on one glide will be available to immediately pick up the rinse water. And with two glides you can never NOT pick up the PS before the rinse solution comes along.
But don't forget that when you dry stroke with a Zipper and no trigger both glides are using full vacuum power at the same time. That is where the wand really shines. Faster and dryer with less effort. Just add a 500 cfm blower and 2.5 inch hose and off to the races you go.
