If you mean to keep ice away from dock?
try dockbubbler.com. it's a true bubbler, not an agitator, comes with all you need, varying bubble line lengths available... and only uses 55 watts, so just leave it on once cold season starts. unlike some bubblers, don't have to keep bubble line level, it has weights on it and meant to lay on bottom. .. but, do need to keep deep enough so you don't get ice in the lines
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