So I was on the right track with my tank idea for running fresh water
through for the last flush of the day. Using the sink makes a lot
more sense. I'm going to put a "Y" in the sink drain line so I can
fill the sink and then use that water to flush. The sink will make
the required air gap.

BTW I just ordered you book.

--

Roger Long



"Peggie Hall" wrote in message
...


Roger Long wrote:
I just went through Calder's section on head plumbing and it
sounds
like a lot of the greater odor of salt water flush over fresh is
not
the salt but all the plant and animal stuff that comes in. A
strainer in the intake line sounds important.

A strainer will keep weeds, jellyfish, and other larger sea life
from being sucked into the head intake line and becoming trapped
there or in the channel in the rim of the bowl...but it won't
prevent sea water intake odor. Sea water--especially coastal sea
water--is alive with microscropic animal and vegetable life that
die, decay and stink when it sits and stagnates in the intake line,
pump and rim of the bowl. Flushing all the sea water out, especially
at the end of a cruise, before the boat will sit for several days or
longer is the only way to eliminate it. Just pouring fresh water
into the bowl cleans out the head DISCHARGE line, but it won't rinse
out the intake and channel in the rim of the bowl, because nothing
that goes into the bowl is recirculated through the intake...if it
did, waste in the bowl would recirculate too.

So the only way to get rid of it is by using some means of
introducing clean fresh water into the head intake line--but NOT by
connecting directly to the onboard fresh water system! There's no
way to connect any raw water toilet to the fresh water system
without risk of polluting the potable water supply...and every
toilet mfr warns against doing so in their installation
instructions. Only toilets designed by the mfr to use pressurized
flush water should ever be connected to the fresh water plumbing.

--
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/store/custo...0&cat=6&page=1