If you have a CatGenie with the drain line connected to your laundry drain, I envy you. If contemplating a CatGenie, I strongly recommend connecting it in the laundry if you have the space.
If, like me, you haven't the room in the laundry then you'll have to connect the drain to the toilet, but this presents a problem: cleanliness and flushing. You have to flush the toilet after every cycle or the pureed poop/pee mixture will form a nasty crust. This uses a lot of water - or requires some heavy duty cleaning.
Fortunately, there is an alternative that both keeps the toilet sparkling clean and uses no additional water whatsoever.
NOTE: This modification assumes you can dedicate a toilet to this use. It will not be useable by humans in this configuration.
Step 1: Grab the Drain Hose
OK, well - I guess Step 1 should actually be "Clean The Toilet", but I figure you can handle that.
After that, grab the drain hose.
Straighten out the rubber end of the hose and hold it against the bottom of the bowl.
Step 2: Flatten the Hose Against the Bowl
Holding the hose flat against the bowl, push it down the toilet and past the "U" of the trap. The end of the hose swivels, so make sure it doesn't rotate on you.
Step 3: Push the Hose Through
Once it has been pushed through far enough, the rubber end of the hose will snap back into it's normal shape, dumping it's nasty foulness directly into the sewer line. To be sure its properly seated, give the hose a gentle tug. If its where it should be, it won't come back out.
Step 4: The Finished Product
That's all there is to it! Now your CatGenie will cycle and dump it's contents past the water in the toilet bowl. Since the hose end is past the water, there is no danger of it siphoning the water from the bowl back into the CatGenie. That would be bad.
I've had two CatGenies connected to the same toilet in this manner for more than six months now with no problems. Enjoy.
My Blog: maddeningscientist.blogspot.com