Nano auto top off

lots of people use the jbj auto top off....never heard any comlaints....even seen one guy use a large 2 gallon water bottle and put a hole in the side and set it higher than his tank using rubber tubing aso it automatically tops it of fusing gravity and air pressure
 
how?
i understand the gravity syphoning thing but not the air pressure
how would you stop the flow when it gets full enough?
 
That sounds like what I thought about doing. One airline hooked to the bottom of the sealed container and one to the top. The other end of both lines placed at where you want your water level. As the level lowers it will allow air to enter the line going to the top of the container and let water come out of the other line. As it rises it should stop the air from coming in and stop the water from draining. I can't remember whether I saw it here or just came up with it tho, oh and I still haven't tried it out yet :(
 
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