H2O and CO2 must mix in an open line (not closed pressurized vessel) via stainless steel membrane; the dilemma is: H2O incoming line pressure is approximately 50psi and CO2 line pressure is approximately 100psi. The problem arises when both elements collide at the point of the membrane where some pressure is created and at which time the pressure from the CO2 attempts to back pressure the H2O back down the line causing a significant loss in H2O volume. I believe that the pressure of the CO2 should remain high in an attempt to force a carbonation mixture with the H2O in an open environment. These are the two concepts that I’ve devised: a) Increase the pressure of the H2O so that it will remain consistent in any environment, and if so what is the best solution for do so? b) Intermittently inject the CO2 into the flow of H2O, and if so what is the best solution for doing so? Thanks in advance for any help with this problem.