I’ll see if I can find his contact and reach out.
Have you looked at a whole house water filter, A lot of them have pretty good flows
If you are interested in saving water use high pressure washer with strong pressure and less water starting 8.5 liter per min , follow this to find the best pressure washer ever
And make sure you’ve got your insurance agent and policy on hand because blasting away cars paint at a dealership will add up quick!