My Pond Prowler II has become too heavy for me to drag up the carpeted slide I use to launch. Can there be water in hull? How did it get there and can I remove it?

Thanks 

Add a drain plug like this https://www.austinkayak.com/YakGear-Kayak-Drain-Plug-with-Base/ACK213P.html

Turn it upside down. The water will drain out. I have to do mine every couple months or so.

Hopefully it’s not what I ran into with a used Pond Prowler I just bought and sold. The styrofoam was saturated, so it weighed about 200 pounds. I just sold it to a guy tonight because I don’t have time for another project.