Re: Back for more - portapotty vs. manual head
Re-route the waste line up to a vented loop and then downhill to the holding tank. Consider the Lavac head to use little flushing water, given the very small tank.
I only repeat, since this was buried in a note that appears before the question was asked again.
If it can be done, I prefer a holding tank as one must use nuclear chemicals in a porta-potty that are ultimately dumped into the environment.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.