As Rex and Kevin said, forgitabout the adjustable sprayer, it becomes worthless after a while. A good, no nonsense, inline sprayer will give you years of reliable service. Just choose the dilution ratio you desire by using the various metering tips or just use the 4 to 1 chemical draw the Dema valve pulls (as I do). I just mix the powdered prespray Grease Eraser, 2 scoops (6 ounces) in the 5 quart container for most all situations. Sometimes more on a trashed job, but I augment my hydroforcing with a two handed trigger spraying of more appropriate chems with two Spraymasters to quickly hit any heavy deposits. A quick once-over with your 175 and every room is perfectly preconditioned.