O2 pressure from welding tank

[Cold_Steel]

I have a welding tank that I am using to oxygenate my wort. I am using a .02 micron stone. What do I set the regulator for or how much psi?
Thanks

 

[Yuri_Rage]

Set it for zero, then open the tank valve. Slowly increase the regulator setting until small bubbles begin rising to the surface of the wort. It won't take much.

 

[Cold_Steel]

thank you sir!