This is all great. I'm trying to find a solution and avoid using plastic. Right now I have kiddie pools which I move around. If I have to I may try the 1/2 gallon drum. It would be deeper, much easier to empty and last longer. I wish I could find some more natural substance that is safe with a big old drainage hole in the bottom that I could open and just hose out the pond and scrub it. I only have two miniature Australian Spotteds and one Pekin. I may get one or two more miniatures but no more. I've been looking at large planters but so far none with drainage. But what about bacteria? I've never thought about that ... just about the algae in the warm weather.