It's a simple enough theory and all (Fluid Dynamics) but I also had the same problem. If you are using the bucket as it would normally sit and not the upside down version, here is what I have learned. A) You must have an airtight lid. Any air that leaks into the bucket through the lid will empty...
Looks great, I'm ready to upgrade myself....buckets do get kinda old after a while. Here's my question. Has anybody come up with a good anti-freezing technique. In Indiana it may be +100 in the summer and 0 in the winter. My best thought so far would be heat tape that would be used for plumbing...