OK, so it's not up to "Peggy Standard"

It's not up to any standard, Lloyd. Would you dump a portapotty down
your sink? 'Cuz that's essentially what you're doing by dumping your
holding tank through the sink drain. ANY problem or backup, and you're
gonna have a sink full of sewage. Even without any problems, you're
gonna have e-coli in the same sink drain that you use to wash dishes,
your face, brush your teeth, etc...and bacteria migrate...mulitply while
the boat sits...anything you set in the sink can pick it up.

How you ran the plumbing is irrelevant.

Peggie
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Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://shop.sailboatowners.com/detai...=400&group=327

http://www.seaworthy.com/html/get_ri...oat_odors.html