1: "Insulate trough with foam board."

2: "Install a water heater."

3: "Use a floating tank heater."

4: "Add salt to water to lower freezing point."

5: "Keep troughs full and moving."

6: "Add a solar-powered water circulator."

7: "Use a trough cover."

8: "Place a heat lamp nearby."

9: "Build a shelter to protect trough from wind."

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