Frank...
You can find out about the recirculating toilet and everything else
about a Trailmanor at www.trailmanorowners.com...
Search for "toilet".   search for anything else and you'll find
answers..
www.trailmanor.com is the factory site... the trailmanor owners site is
made up of owners and wannabees....
in the meantime...the toilet takes an initial charge of @ 2 1/2 gal of
water, then chemicals are added.  As you use the toilet, the liquids
are recirculated in the toilet tank.  TM's do not have a large black
water tank.  When the toilet is full, then you simply dump and recharge
the unit...
Leon in Texas....who owns a TM.  email me direct if you like at l trib
at yahoo dot com   all one word
hope this helps