>>19
you obviously do not know anything about plumbing, it all goes to the same place! the ONLY difference is when you flush your useing a good 3gallons of water average, there is a "trap" that closes off sewer gas's, guess what? THERES ONE ON THE TUB TO! or shower, and sink's! if you pee in the shower/tub it goes down a pipe and to the EXACT same pipe as the toilet!.
>>20
number 22 is correct, in fact, most apparatments have shower/tub combo's, the tub is usualy to dang small to actualy enjoy a "good soaking bath"
did i mention, IT ALL GOES TO THE SAME PLACE, heres a fact for ya, alot of communatys use "reclium water" i.e. reclaimd water, for gardening and golfcourses, its RECLAIMD water from THE SEWER, keep that in mind if your one of those folks that drink from the garden hose :)