Hello, and welcome to BYC. I'd let the water set over night so that the chlorine level lessened. Ducklings need water deep enough that they can immerse their entire bill.
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Welcome from New Orleans. Wow you have already gotten some good advice. I agree you should keep your thread on the duck site updated. That is probably where you will get the best answers for questions regarding ducks. Also check out the heating pad mom, those have worked great for my chickens in times of need.
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