Join Date: Feb 2010
Location: Narragansett Bay
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If you treat with Raritan KO and have good air exchange (vent line), the tank will theoretically maintain itself. You then have to be very diligent that absolutely nothing goes down the head, except toilet paper and stuff you previously ate. Nothing, or it will kill the good bacteria in the KO. However, after two weeks, I would become concerned about sediment that could clog your discharge tubes. If we are going to leave a couple of flushes in the tank for an extended period (usually 4 or 5 days at the most) we have a liquid deposits only policy at that point. Other needs go ashore.
Additionally, you would have to flush plenty of fresh water to clear the line before you depart, one gallon minimum up to three gallons. That can eat up holding tank volume.
If it were me, I would pump it.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.