Agreed, James. The only question is whether I should have the EarthTainer do double-duty as the water supply for the other containers, as such:
It seems to me that the hoses connecting the EarthTainer to the 5-gallon buckets don't even need to be downhill for the purposes of gravity... so long as they are below the water level on both sides, right? For example:
I'm not a hydraulics expect (clearly), but it seems that such a setup should work to keep the water levels even.
I used Paint.NET for this stuff... it is free and is a huge step up from Paint!