Talk:Benzene/@comment-107.145.172.10-20160229013054/@comment-77.200.161.19-20160816200023

This is what an actual rebreather (the close circuit ones) does IRL, historically it uses potash to capture the carbon phase. Problem is that you still use O2 to do oxydations in your body for generating energy, so rebreathers comes with a spare pure O2 tank. A computer and sensor array is used to readjust the pure O2 flow so it keeps being close to 21% or any value you set in.

I have to add as i read comments about nitrous content that "tech" divers tend to lower the amount of nitrogen dissolved with any non reactive gas (helium for exemple) to keep the NOx blood pressure low. Nitrogen is causing depth poisoning and is the dangerous gas causing diving trauma.