> Underwater this caused me a slight amount of gagging ;-) and the Jet to > freeflow brown gunge (well the water in front of me turned brown anyway!). The > Cyclon didn't freeflow but still gave almost pure gunge - no air. The Auto-air > (same cylinder) did give a small amount of air but probably because I was now > the right way up and heading for the surface (trouble with a single cylinder)! When you were on your way up (assuming the water was no longer entering your 1st stage) did the Jet stop freeflowing once it had finished emptying itself of water? A