method
If a barge is out at your island with a truck to do septic pumpouts they may be able to clean out by pumping liquid back and forth from the truck. (The pump goes both ways). Be prepared for a big price. It might be easier just to shovel it out before the first use of the new season. I know it is always the first task when I go up for the season although my young boys always want to be the first to "try it out" so I have to make them wait.
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