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	WRT Richards questions; why does the Poseidon blow ice when it's
cold? My understanding is that the design is *old* and was developed at
a time when a high performance cold water reg was needed, as there was
no other. Asthetics went by the by. Personally I find it comforting to
have the ice coming out as i) it tells me that freezing is an issue, if
I was in doubt before, and ii) at least it isn't staying inside to gum
up the works. I don't know whether it would be possible to teflon coat
the part that freezes (I think it's that little metal 'vane' inside the
mouthpiece) to prevent nucleation, but it certainly doesn't seem to need
it as far as air delivery goes.

	BTW I agree the poseidon isn't as comfortable to breathe as
other designs, but once I'd got used to it I began to find the others
'squishy' and not inspiring of confidence (hmm, advertising tag line
here?).

	Fresh water freezes more than salt because of the phenomenon you
described, i.e. if the decompression supercooling drops the ironmongery
to say -2C, then fresh water will freeze, salt won't. (Fresh freezes at
about 0C, salt at anything down to -10C).
	
	Cheers

	Jason. 

	PS who moved the ozone hole over Scotland, we're frying here!

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