Welcome to BYC!@Fritz21
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, and then it's always there!
Can we get a close up? I assume you used a quarter turn 2" ball valve to flush it. Side mounted or bottom???
and yes, would love to see how you are heating it, and how you keep the ducks from wetting their food there, and making mess of it?? Other than having other water sources closer to the food, ducks being lazy...