Are you certain? I've spent most of my dives in Florida springs, which can have flow rates above 100 cubic feet per second. You can basically get blown out of D

Are you certain? I've spent most of my dives in Florida springs, which can have flow rates above 100 cubic feet per second. You can basically get blown out of Devil's Eye at Ginnie Springs if you're not careful with your trim when ascending. The downside of still systems is that any silt you stir up can kill the visibility for hours / days, which would cause problems for light-based beacons.