I was just told by my LDS that they wont sell 100% O2 anymore. They will only sell 80%. The explanation was that training agencies are switching to 80% O2. I found a very old email from Tom Mount stating that the 80% was for training (http://atlanticwreckdivers.net/Articles/DecoGas.html ). It cited cave as a more forgiving deco environment and did not imply that the 80% O2 policy applied there.

I am going to try and explain that to the LDS owner and see if they'll change their minds on this. Otherwise I will need to buy my O2 elsewhere. Has anyone else encountered similar issues? Is there some new policy change in training agencies that I am not aware of?