Where are you?
Where you are located makes a big difference in how a circulator works, and if it will protect your dock.
One of my docks does not lift up so I put a circulator in next to it. In April, when a 100 foot area in front of it was clear I shut it off. The following morning a large mass of ice blew in with the wind and wiped out my dock. Nothing would have prevented that except some triple pilings.
Oh well............
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