just turn on the taps and let co2 flow.
if your cylinder is full, the pressure readings should be about 1000 psi or about 68kg/cm2.
the big black knob is the cylinder main valve and 1/4 turn is enough. this is just an on/off valve.
the other valve, which you use to control the bubbling rate, is a rather crude device. you'll have a hard time trying to get the bubble rate that you want.
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