I've got the factory front ballast in my 04 Sanger V210. It has two aerator pumps, one for fill, one for drain. When I start filling, the bag fills with water and a lot of air. If I step on it every minute or so it seems like some of the air is going out, but it's annoying (and slimey). It's hard to tell how much water is in there vs. the air. Is there a way to get rid of that? I've read about vents, does that mean I need to add another through-hull to vent the bag (in addition to the drain line?). The fill comes from under the boat (obviously) and the drain squirts out the side, above the water line.
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