Bryan, regarding the guy in front of you applying chems with a flojet, I recently thought I might try the same idea, but only using a small PWer. I have a couple of old units that aren't worth much to me anymore and thought about converting one to a chem feed system when I have an helper. I also prerinse (we are cleaning brick), so the small PW would be prefered to the flojet for me. However, I think you'd get your chem on the wall a lot faster doing this. Worth some thought.