NateS - Try this for some troubleshooting your extra psi problem. I am pretty sure the Vertex membrane diffuser was designed to normally handle or operate at 0.5 to 4cfm with peak flow of 6cfm were damage to the diffuser could occur. Ted Lea could confirm this. To test the Vertex diffuser which I assume is a dual head model, connect the diffuser directly to the compressor using a short piece of 5/8"ID hose. The diffuser should be out of the water and near the pump so the only thing receiving air is the diffuser through a short hose. Dual head diffuser will result in each membrane getting less air volume than just one membrane. Turn on the pump and the gauge (30psi model) should read 0 pressure. I just tested a single Non-Vertex 9" membrane connected to the pump with 4.5 cfm and pressure on gauge read 0. This test means there are enough holes and large enough holes in the diffuser to not cause backpressure on the pump. The Vertex diffuser could be causing some sort of back or head pressure.
Last edited by Bill Cody; 04/02/21 09:16 PM.
