"K2" wrote in message
oups.com...
Peggie Hall,
I asume that you will see this message. I am a little worried about
trying to clarify your response after viewing the responses tacked
onto my initial post.
If you would please review my configuration from my initial post. This
boat (since 1980) has always been configured: head to vented loop to y
valve directional to either holding tank or thru hull. The vented loop
is well above the water line, I have never had to close the thru hull
when sailing (with the y valve directed toilet/thru hull). I
understand that the vented loop is not necessary between the head and
holding tank, but it certainly does no damage, and the plumbing is
already in place.. To do what you recommend requires quite a lot of
re-
routing and a heck of a lot of labor. Why would I lower the vented
loop down by the thru hull, necessitating the requirement to sail with
the thru hull closed? I simply believe that injecting the macerator
discharge into a "T" between the head and vented loop (with a ball
valve between the "T" and toilet to prevent backflow into the head
when operating the macerator) would be a much easier endeavor than
anything else.


Peggy is temporally out of commission. She's suffering from the
heartbreak of psoriasis. But, she asked me to answer your inquiries.

First off she said she gave you the wrong advice or you misunderstood
what she told you. NEVER put the vented loop below the water line. That
defeats the purpose entirely. Instead of air going in to break the
siphon water would come out of the bowl to flood the boat.

The vented loop is there only to break the siphon for the intake water
for the head. Nothing else. It should have nothing to do with the
discharge loop or valves.

The macerator discharge should be directed into the holding tank via the
Y- valve or out the thru hull via the same Y valve. Always keep the Y
valve locked to the holding tank position in no discharge zones. A ball
valve on the pumpout might be a good idea provided it is placed close to
the holding tank. It serves to limit odors in the plumbing from tank to
pumpout fitting. A good way to flush out your holding tank is while it
is being pumped out open the Y valve to the thru hull and this will draw
raw water through the system. If you pay for a pump out let it pump for
several minutes after you think the holding tank contents are outta
there. A good flush makes the whole system sweeter. So what if it taxes
the pump out station. The more breakdowns pump out stations have the
better because then we can claim we have no choice but to poop in a
bucket and empty it directly overboard.

Wilbur Hubbard