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	A number of you have written to me direct about the Poseidon warning
which I mentioned yesterday. I appreciate that to a large extent this warning
has been written for legal reasons. However I know that some of the parts in
these valves are still made of materials which will deteriorate quicker in high
O2 environments. The "risk of explosion" is probably scaremongery, but I think
that if one chooses to use any reg. straight from the box for 100% O2 then one
is taking a risk.

	Perhaps what I should say is that if the valve is regularly serviced and
monitored for signs of deterioration then there may be no increase in risk.
However, I know a number of air divers who may be inclined to use their valves
with high levels of O2 and those same divers are not the most vigilant with the
condition of their kit. For this reason I believe one is "better safe than 
sorry". I personally O2 clean my valves for O2 grater than 40% but I like life!


	Hope this clears up what I may have wrongly suggested. I am not an 
expert on this subject and would welcome any corrections if I am talking crap!

Cheers,

Dr Ali Lawrie.

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