I have been playing with numerous different designs for over a year and half now....I have another design which I will show latter but it requires 4 buckets but is my favorite....got a good deal on the used buckets....lol....but the spacer slats are survey stakes cut at 6 inches which still gives around 3 US gals water reservoir with 1.5" of air space below the bottom of the top bucket....cheers....
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