After the first version of your Venturi (black) it was leaking (left side) and did not have enough suction power to work. So I ordered your latest barbed version, but after installing that one it did not leak but it again did not have enough suction power (not sure why?). I took last shot at it and installed an additional ball valve in between the filter and the Venturi. Basically that ball valve needs to be almost closed for the Venturi to work. Lots of plumbing parts later and now it bubbles!
