Steve Lusardi wrote:
Does anyone know what the mimimum slope of this drain can be that will not
cause clogging? I really do not want to use a second grey water tank in the
forward end which will cause loss of space and another through hull fitting.
It is preferable to use one large tank for the whole boat.

Why are you installing a gray water tank? Gray water (galley, bath and
shower water) can go directly overboard in all coastal waters and,
except for only 2 or 3 places, on all inland waterways too.

If you're mistakenly referring to toilet waste (black water) as gray
water, holding tanks should be within about 6' of the toilet--'cuz
that's as far as bowl contents will move in the amount of time anyone
will spend flushing. So if you want to avoid leaving waste sitting the
line, a single large tank to serve two toilets at opposite ends of a
larger boat isn't a good solution.

If you're thinking of combining black water and gray water in the same
tank, CG regulations won't allow it. Gray water and black water plumbing
and tanks must be completely separate...can't even share a common vent.


--
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/books...ku=90&cat=1304