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Bill, are you saying that it takes a lot of air flow in a reg to freeze it up during cold water diving? (Again, I only see cold air, no cold water here in Florida). -G SNIP> No, I think the main problem is water in the 2nd stage freezing on sub-zero metal parts in the region of maximum expansion, ie the valve seat. My Odins used to give ice chunks in fresh water below 4 degC at normal breathing rates, but since I cleaned the 2nd stage diaphragms, the reg is much drier and the ice chunks stopped. This means the ice was forming from water leaking into the reg, not from condensation from my breath. This ice doesn't affect the Poseidon servo mechanism because the servo pin is 2" away from where the real flow is, and if ice does get into the main outlet holes it doesn't seem to stop the bladder from sealing. Other downstream type regs may get jammed open as there is only a knife-edge and a rubber seat to make the seal and this is where the expansion occurs. If Wakulla was cold water, you probably wouldn't be able to use G250s at 300' even with low breathing rates. 1st stages shouldn't freeze as long as no water gets past the inlet filter and the spring chamber has anti-freeze fluid in it. Cold air shouldn't be a problem in Florida, as everything will warm up as soon as you get in. I'm suprised by David Drake saying you can swop Odin 2nd stages underwater. I once got water into the IP hose whilst swilling off, and when I next turned the air on, the water being forced out bent the servo pin, causing a permanent free-flow. Bill.
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