Wow, I have yet to use my TM's toilet and am a little askeered to.
I'm not sure about the Thetford swish system.
I'm considering the Thetford curve change-out that's been talked about on this forum. It seems like it has the same capacity and doesn't need a dump station and hose to dump it.
http://www.trailmanorowners.com/foru...thetford+curve