Re: Discharge of grey water
Generally, grey water is not restricted in NDZs. However, there are local exceptions, which you would have to research. There have been EPA proposals to include grey water, which are ridiculous IMO.
The 3nm limit is for black water.
You can't have a vented loop in a sink, or it wouldn't drain unless it was pumped overboard. We have sinks that will back up when healed over, so we close those seacocks before getting underway.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.