I have been reading more on the venturi injectors. Looks like they use them in hot tubes and pools but the price is kind of steep. I'm seeing 100 to 200 dollars just for the valve and to top it off it looks like nothing more then a funnel shaped T. At any rate I would could easily incorporate something like this in my grow but I wont if I cant get that venturi injector for under 20 bucks or build something similar.