We were cleaning some nasty looking mildew covered brick sidewalks today with the surface cleaner I built. We had to go over it 2 times to get it clean. My main helper (only), my son was working and came up with a good idea. Would it be possible to put another 2 nozzles on it and put them in line with the other 2. I thought it might work by putting a tee in the middle and put the tips there. I have a 5 gpm 3000 psi machine. If this would work what size tips would I need?