SCFH, SCFM, LPH, CFM... There are so many units and I havent found conversion charts for them.
That asside the amount of air a venturi or airpump pulls or pushes is directly influenced by the amount of preassure in their application.
With an in-sump Venturi it can vary depending on your sump level. With Airpumps it varies by how tall your skimmer is..
Does anyone have a flow meter who has measured their skimmer before?