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Yes! I clean them out, fill them with water (lid off), and place them in the freezer over night. -place them upside down in the waterers the next day, and it keeps the water cool all day long.

We've used Harris Farms EZ-Fill Drinker, 5 gal., and Harris Farms Drinker, 3.5 gal. Both work well, and allow us to freeze milk jugs filled with water and place them in the waterer when the heat gets above 95 degrees or so. -don't know what your climate is like, but these stay cool well.