I did not know you were asking me about PPO2's, I thought there was somebady 
else named George . I use 1.4 ppo2 max for bottom, and tha is at the deepest 
depth of the dive. This is time related, so is the max. For dives over 100 
minutes we start to lower it towards 1.1. I used 1.1 the other day in Wakulla 
for that 120 minute at 280 dive. Then you have to watch spiking the oxyegn on 
deco after a long expopsure. Instead of the usual 1.6 max for deco, we moved
the 
bottles up 10 feet from the 1.6 point to start the stop. We took a back gas 
break for 20 minutes at 70 feet, and one every twenty minute for five 
thereafter. We treated this like deco, no addition of time. For long nitrox 
dives, it is very important to back off the PPO@, and not to spike even to 1.4 
until you have taken a break,. For the dep dives we either do oxyfgen in a 
habitat, on a face mask, or in less than 20 feet of water. 

  All of the NOAA horsehit and agency crap can be tolerated for most people for 
most dives, but when you are doing the real thing, back it off. Only a real
deco 
weenie would dive a hot mix, and that is usually some slob who should not be 
diving anyway. Decompression sickness is like spraining your ankle playing 
football, not even enough to miss a practice over. If you think it could be
more 
thatn that, get checked for a PFO, and get in shape.

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