If you flush well and exhaust all the nasties out of the lines then there
will be no odors as long as the holding tank is well ventilated. When
leaving
the boat for a long period, run fresh water through before leaving. Also,
using a treatment like Raritan KO in the bowl will help.

Doug
s/v CAllista

"Roger Long" wrote in message
.. .
I'll tell you what got me going on this. I design boats like these

http://home.maine.rr.com/rlma/Challenger_Class.HTM

and work with a very experienced shipyard that takes care of the systems
design. The boats are fast so weight is an issue. I started by assuming
the heads would be salt water flush. They said, "No, no, it's got to be
fresh water because of the smell. It's worth the weight penalty of
carrying more fresh water."

The boats do smell better than the salt water flush boats. Fresh water
flush obviously isn't practical on a 32 foot sailboat but this might be
the next best thing.

--

Roger Long