I've been using a hard plastic kiddie pool about 36" diameter and a hard plastic concrete mixing tub as ponds for my ducks. I dump and rinse them every day and scrub them as needed. They don't seem to poop much in them, but there is of course ample mud in them. I figured that when winter came I could use huge rubber pans from TSC that are a bit smaller in area, though taller, but where I could break up ice. But to prevent much ice, can I use a floating pond de-icer? Or is one that sets on the bottom, with a cage, better? Any recommendations as to type I should get and possibly where to buy? I know I need ones where the ducks can't touch the heating element. I also see where some shut off if knocked outside the water. I don't know how klutzy the ducks will be or what they'll think of something already in their water. I'm sure they'll have something to say about it. I have no electricity at the duck pen yet, but plan to run a GFI outlet down there in the next few freezing days- brrrr. This is my first winter with ducks and chickens so any suggestions are much appreciated. I have 3 pekins in one pen, and 2 muscovies in the adjacent pen. My chickens also like to drink out of the pools. Thanks!!!