Yeah you could Tom, but I have to say that, in my experience, it just doesn't need it! The water coming in vertically dissolves/diffuses the gas at the top brilliantly as it comes through the any air bubble and drags it back in. I never got a gas build up in normal use, only a small amount after it was cleaned. However it might be an idea for the one I'm building with a bend at the top if the gas collecting there is an issue.plantbrain said:Ed you can add the venturi loop to this by addign another air valve about 6 cm down to atomize the gas build up inside later in the day, this will improve overall performance and reduce backpressure.
See my web site on the dual venturi in line.