The "gastric reflux" of the head seems to be gravity related, and only happens when the boat is moving in waters with some wave activity.
The bowl half fills, requiring a "dry" flush to clear it again. Upon arrival, we had the holding tank pumped out, but haven't tested since. I suspect it has much to do with hoses and hose placement. If the boat is sitting, everything is fine. Peter Delean North Bay, ON Drifter II C&C 30 Mk1
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