[DK on the road]

I'll argue, its a good system. just not simple.

By design the MP toilet allows the effluent to break down in the "hopper" tank, that is the first chamber. This creates a better environment in the main tanks with may not have the best organisms to break it down as fast. The discharge of the hopper is about 2" up off the bottom of the tank. Mostly only liquid ( or any thing that floats) is ejected to the main tank on a flush. The hopper tank gets charged with air once the toilet flapper closes and helps move and clear any effluent available to discharge under pressure to the main tank. This is important to understand for rear toilet situations. The rear toilet has about 18' to 20' & 8 each elbows on a 1 1/2" pipe before it gets to the main tank.

The system works well if the coach sits level or slightly nose down. Not cool to be nose up, or wrong paper, or hard water, you can accomplish the Trifecta as I did.

I learned this the expensive way, I had to remove the floor in the MB and clean out the pipes shortly after purchasing the coach.

BTW, I also learned that all the bathroom pipes are separate, Toilet, sink, shower. One fixture will not help flush the other clean.