The bowl on my Jabsco head kept filling up. After checking everything I found that the holding tank kept filling upafter about an hour. The water is coming from the macerator which is connected to the underwater thru hull. The path is from the thru hull, through the macerator and into the holding tank. I tuenrd off the valve on the thru hull and now the holding tank doesnt fill up and neither does the bowl. Question is -- Should the thru hull valve be closed, except when pumping out the holding tank. Appreciate some of your knowledge. Thanks
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