Found some more photos while sitting here at home during the pandemic. This time from our 2018 seminar in West Carlisle, TX. The photos show a good looking jet siphon stream. How much is it flowing? What is the pressure needed to make it look like this? We don't know. We do know that the pump operator's goal is to "make it look like this." "This" generally is close to optimum flow in terms of pump capacity use and jet siphon performance. Quite often "this" is somewhere in the 90 psi to 125 psi range. Running at a higher pressure generally produces a diminishing "return on investment" and begins to impact pump capacity.