"We have a $17K unit at work that produces 1L @ atmos pressure per hour."
Either that thing is producing some uber clean lab grade hydrogen, or you guys got ripped off. I doubt precision lab equipment is necessary for this application.
Besides, I've built a machine before using stainless steel scrubbers that put out far more than 1L/hr. Too bad at the time all I did with it was make explosive soap bubbles.
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