The mix changes the fraction of oxygen throughout the dive in order to maintain a constant PO2. In order to maintain a constant volume in the rebreather a diluent must be added which compresses at depth so more diluent has to be added. A hot diluent is one that has more oxygen than the PO2 of your planned depth. A 10/70 diluent will not support life at the surface without added oxygen. That is something that can happen accidently and I lost a friend this year to that very thing.
First, thanks to Cave Diver for providing a separate thread to discuss for non-CCR divers as I have a few questions as I have followed along on the original thread.
What is meant by "a hot dil" and "dil flush"? I am assuming it regards the dilution of the trimix, but please explain what is happening. I am not trimix trained, so the next question is the 10/70 being a hypoxia mix at the surface. With the CCR, is the mix changed on the fly, or is constant throughout the dive.
Just trying to follow along with the issue raised as a potential cause of death.
Thanks,
Dive within your training.
Keith