Is this in a coop or run or...?Alternate method to prevent water freezing
I have used this method for 30 years. Your concern about the birds digging up the manure has never happened. The temperatures get down to -30°F in our winters. In a milder climate, this method should prevent the water from ever freezing. In my climate, when the temperatures hit -20°F there is usually a thin layer of ice that can be easily removed in the morning and the water stays open all day.
So far this year the temps have only gotten down to the mid teens and there has not been any ice at all.
Any problem with birds actually falling or stepping in the open bucket of water?
Did it work as well with chicken poop as the horse poop?