JG wrote:
Why not install the intake below the water level so the noisy intake
pump could be eliminated?

I'm not sure what you mean...'cuz all toilet intake thru-hulls are below
the waterline...they have to be to pull in any water. But if you mean,
isolate the intake pump so it's near the thru-hull, it's mostly only
"thrones" which make that possible...'cuz 99% of electric toilet don't
have separate remote intake pumps...the intake pump is on the back of
the toilet, powered by the same motor as the discharge pump and
macerator...so it cannot be isolated from the toilet. Nor are they
designed to allow passive flow of flush water intake...the intake pump
is an impeller pump that has to pull it into the toilet far enough to
let the discharge pump--also an impeller pump--to push it out.

--
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