During the winter months some things handle the cold better than others. Fountains made of concrete or resin can crack if left out in the cold for a long period of time. If you know there is going to be a hard freeze simply turn the water off and let the fountain drain. Most fountains should come with a drain and plug. Fountains with multiple tiers can be a little bit trickier. Pouring anti-freeze in your fountain will only make the problem worse. For birdbaths simply turn them over during the winter months.
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