Dennis Gibbons wrote:
Peggy,
Have you ever heard of the following setup:

The waste tank is ABOVE the water line with a bottom drain to a seacock.
There is a second drain from the top of the tank to the deck pumpout.
The head pumps up to the top of the tank.
Close the seacock in protected water to keep the bad stuff aboard and then
open the seacock when you get out.When offshore, simply leave the seacock
open to drain as you go (so to speak).

I'm not crazy about that set up. When the seacock is closed waste has to
sit in the line to thru-hull, permeating the hose...any sludge in the
tank will end up in that hose, so if you're in coastal waters very long,
that can cause problems...and I can't see any reason to go through a
tank at sea instead of flushing directly overboard. If the tank vent
should become blocked, you'll have problems flushing the toilet due to
the backpressure. Worst case would be a blocked tank vent AND a clogged
overboard discharge hose at sea in 8'+.

--
Peggie
----------
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://www.seaworthy.com/html/get_ri...oat_odors.html