I downloaded that owners manual which is available to me from..
HunterOwners.com downloads
If you have the electric Quiet Flush toilets, then you have a single Hold tank and a single macerator pump.
All of your toilets flow to the single Hold Tank.
I saw an optional direct discharge at each toilet.
If I read the manual correctly, you should never have to use the Forward Cabin toilet in the
direct Discharge mode.
If you want to use that optional discharge, you must close the through hull valve after each flush or...
It will
back flow sea water to your main hold thank.
Jim...