I have been using an x-jet for house washing. I do mainly small residential houses so the x-jet works good for me. I have a bigger job coming up and would like to down stream to save time and my back carrying that bucket. I bought an Adams acid injector awhile back and want to use it. I have a 3500 psi 4 gpm pressure washer. I was looking at the specs on the Adams injector and it says 3000 psi. Can I still use it with my 3500 psi? Also to apply chemical on the lower areas I will use a 2540 nozzle and for the higher areas I will use a 0040 nozzle. Is this the right set up for the psi and gpm of my machine? This is my first post so not sure if I have a signature or need to have it to post. thanks