I removed the soggy wet styrofoam floation from inside the seats and the bow tank last winter. It weighed 50 pounds!!! I've heard of it weighing as much as 100. I put a 6 inch "inspection" port in each tank and have been stuffing empty plastic Coke and Gatorade bottles in them all season.
How does the water get in there? My DS I has an opening with a stopper in it on the bottom front of each seat. (By front I mean facing the mast) Each time I take a stopper out considerable water drains out, but I can't figure where it is coming from. The boat yard guy says it gets in through the stoppers, but if that's the case, then why have them at all?