Quote: (Originally Posted by
Juz)
At the beginning of the stop you'll see the loop 'crash' quite quickly, but towards the end of the stop the loop PPO2 stays up with no intervention from me - I consider this to mean that I am relatively clean.
I remember when I had this very epiphany.
At the begining of the deco stage you are exhaling nitrogen and helium into the loop, dropping the PO2.
At the end of the deco, the PO2 drop should be at your metabolic rate.
That is how you know that almost all of the excess nitrogen and helium are gone.