Here's my contraption: The long pipe contains hydrogen at -240 C. When I route some polluted oxygen in, it usually takes a while till it cools down but thanks to this low temperature it happens sooner. The pipe above the mesh floor has hydrogen at -150 C. It's there to thaw any solid oxygen that starts falling from the cold pipes when the gas pressure gets low. But for some reason the mesh tiles retain their +20 C temperature from when they were built so maybe the pipe is not nece