Guess I'm shooting from the hip. No idea on my flow from an old Williams wand and HD red tank. I turn the valve until I get some wort movement. I then set my timer for 90 sec. I don't have a DO meter, but have read testing from someone and that is were they got their correct numbers. That is in 12 gallons. I'd love to test it once to see. I'm buying an O2 tank and adding the flow meter. My current methods will have to work for now.
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