Well, since I switched over to pressurized CO2, I've connected it into the inlet. Don't hook it up to the inlet with DIY! As I posted previously, what can happen, (and most likely will), is that the venturi effect created at that inlet can suck the contents of your yeast/sugar mix into the tank! With DIY CO2, I just pushed the tube up towards the top of the cylinder. That allows the gas to mix with the water without the danger of sucking the contents out of the bottle.
There is an improvement that would make it a little better, but I switched over to pressurized now and have no need to try it. There is a smaller tube inside the larger, outside cylinder. I was going to drill a small hole in the top cap and run an airline from that small hole to the venturi inlet on the pump. If you position the airline from the DIY CO2 so that it expels the bubbles into the inside tube, they would rise to the top, get sucked into the venturi, and then recycled into the 'reactor chamber'.
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