I just purchased a sintered air diffuser stone and a small O2 tank. The advertised pore size in the stone is 0.5 microns. I doubt anything that would like to eat wort would like to live in a compressed tank of oxygen and 0.2 micron filters work great for sterile filtration, so I'm thinking I should be safe just sanitizing everything that will touch the wort. All of that is assuming, however, that there aren't larger unadvertised pores in this stone I just purchased.
For those of you who use pure O2 and a similar stone, do you filter the O2 or not?
For those of you who use pure O2 and a similar stone, do you filter the O2 or not?