I have a Gravity I. I notice that the center ballast loses water over time, probably about half a bag in an hour. I would normally just say it has a leak, but a) I do see what coming out of the exit port sometimes when the boat takes off and b) it seems to only lose water when we are moving; if I fill it up, then we park for a while, I don't notice that the water is lower.

Has anyone had a problem with the ballast siphoning out or something like that? Or should I just take it out and look for a leak?