wrote:

After waste goes into the holding tank, can the system be plumbed to
then treat the waste with the treatment device, and discharge the waste
when the vessel leaves the no discharge zone...

Yes. In fact, Groco and Galley Maid Type Is and IIs that are designed to
be installed after the tank. However, their systems are VERY pricy and
really designed to be used on boats 50'+. Smaller systems like the
Lectra/San are designed to accept waste directly from the toilet, treat
it and discharge it. And because the L/S can only accept and treat a max
input of 1 gal at a time--and each treatment cycle is 2.5 minutes, it
would be impractical unless you also install Raritan's new "Hold 'n'
Treat" system that automatically meters waste out of the tank to the L/S
in 1 gal batches and also automatically runs the L/S. They offer it as
an add-on to existing L/S's and also as a complete package that even
includes a tank. You can read all about it he
http://www.raritaneng.com/products/w...ent/index.html

or is a pump-out the only
option to empty the holding tank?

Unless the waste is treated on its way OUT of the tank by a device
certified to work that way, pumpout is the only option. Treating it
before it goes into the tank will NOT make it legal to dump the
tank...'cuz once waste goes into the tank, whether it's been through a
treatment device first or not, it's no longer considered "treated
waste." Reason: only ONE li'l ol' bacterium has to survive treatment to
quickly multiply into way more than the legal limit in the tank.

--
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