I have a 4000 4 gpm washer and I "soft wash" with it. The only thing I did was put a soap shooter tip on the wand. I bought mind from pressure works. I use SH and a product called brown stuff, 2 gal sh,2 gal water, 1 gal brown with a down stream injector. The 5 gallon mix will do about a 2400sqft 2 story home.