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.
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.