ruthhope
Free Ranging
YEs! My son and I are in N Florida: freezing water is not an issue for usSounds like the square plastic tubs for water work great for you. Just wanted to mention, once again, to encourage people to put their geographic location on their member icon. Where I live, in northern Minnesota, we have freezing temps for a good 6 months of the year. When water freezes, it would break any plastic tub. This is why I have to spend extra money to buy those expensive black rubber tubs at our local Fleet store. When the water freezes into ice, you simply turn the rubber tub over and give it a good whack to pop out the ice chunk. Then you can refill the tub. Anything plastic, filled with water, is broken with the first freeze.
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Little Giant Heavy Duty Rubber Tub Durable Rubber Feed Pan on Amazon.com, different sizes available.
I bought my rubber tubs from my local Fleet store a few years ago when they went on sale. However, their everyday price was less expensive than the same items on Amazon. If OP lives in a northern state where you have freezing temps in the winter, then I suggest considering paying the extra money for these type of rubber tubs up front as they will last for many, many years.
For my chickens fresh water, I use the metal water fount and the metal heated base. It's old fashioned, but I have had fresh water (not frozen) in temps as low as -35F overnight. Mind you, the metal heated base only advertises to keep the water from freezing down to +10F, but I am telling you that my waterer, in the chicken coop, was not frozen even at -35F last winter. I don't know how well those metal water founts would work for ducks, but it might be worth looking into if you have cold winters.
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Search link on Amazon.com metal water fount