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Originally Posted by actioncia
Okay I can probably use air check valve to adjust air pressure since I do not have any irrigation parts. As for timer, it only need to be on for the time it takes to consume that amount of volume. For example, if it takes 5 hours to consume 5ml then that is the time you would set the time. No need to type slower just people have not dicover such good things. Regards
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Typical check valves aren't good for adjusting tasks, since they block flow in one direction and let it through reversed.
The trick is to get something adjusted that low. Like in your example, 5 hours to consume 5ml, is going to be pretty hard to find something that doses that little volume in that much time.
Maybe there are airpumps that can be tweaked to output a relatively small amount of air. I tried putting mine on a dimmer, but that didn't seem to work. Perhaps there are pumps that allow you to increase the distance between the swinging magnet and the wires, therefore reducing the pump output.