IamAeolus wrote:
Peggie:

1. The boat does have a shower that is supposed to drain to the bilge.]

Yuk! Install a sump--two if necessary--for your ice box as well as your
shower.


2. Something trapped in the raw water intake to the head is also a
possibility (although it seems to draw water in without difficulty). I will
shut the seacock and run Raritan C.P. thru it and see what happens

Dead and decaying micro-organisms in stagnant sea water won't create a
blockage...so the fact that flush water flows freely means nothing when
it comes to identifying and eliminating the sources of odors.

--
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