Robert Seynaeve wrote:

I have two Jabsco 37010 Series standard electric toilets ( + one
spare ) on my boat. They work fine, but are far too noisy. The
so-called "Quiet- Flush conversion kit" by Jabsco costs around $600
and is really a complete new unit, where most parts seem identical
to the standard unit. The only difference seems that the water pump
is separate and is a more silent model. I think that Jabsco should
have offered a true, lower cost true" conversion kit" for the
existing toilets, where only the pump would be replaced.

Anyway, I would not like to spend approx $1800 and replace an
equipment that still works fine. I am wondering if I could not
achieve the same noise reduction by disconnecting the built-in water
pumps on my existing toilets, and replacing them by external quiet
pumps, which would cost much less. I guess that I would also have to
remove the impellers of the old pumps, otherwise, they would still
make some noise and may end up burning.

Do you know if this is a valid idea, and if it has been tried?

It can be done--and yes, you would have to remove the intake
impellers...but remote intake pumps are really intended to go on BIG
boats that have head intake lines that are so long the impeller in an
integral intake pump would fry before it could prime. So unless your
boat has well insulated bilges well away from living spaces, you could
just end up moving the noise instead of eliminating it...'cuz the remote
intake pump isn't any quieter (Jabsco uses a ParMax washdown pump for
this application).

The easiest solution would be to swap out everything "south of the bowl"
for a version of your toilet designed to use pressurized flush water
instead of sea water. No intake pump...a solenoid valve instead, which
makes toilets that use pressurize flush water quieter than most
household toilets. They also use about 30% less flush water and power
that most raw water toilets. Jabsco does offer such a "conversion"
(everything but the bowl)....and so does Raritan--their SeaEra
http://www.raritaneng.com/products/t...c/sea_era.html It was
designed to be an identical upgrade replacement for the Jabsco 37010
series It's about $350 from boatfix.com
http://www.boatfix.com/elec/rarseaera.asp ...and a whole lot more
durable and reliable than the Jabsco too. You wouldn't need a backup
for it, so you'd only have to buy two.
--
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