So I finally understand this. Like Naja I had to read it about 6 times but I finally tried it and, brilliant! I just tried a little demo with a water bottle and a 20" coil of regular airline tubing in the bottom. I think the coil tends to trap air in itself due the the fact that it is coiled. I am going to try a small container of the correct volume. A quick calculation shows that 1/2" PVC pipe is ~11.85ml per inch. I'll report back if it works.
Wow!
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Dennis Dietz
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