years, many for 100 or so years. So why hasn't the plumbing/piping industry come up with plumbing that doesn't stop up so much? It would seem to be simple: Larger diameter pipes. Larger diameter fittings to match. Larger diameter drain "traps". Larger radius for the bends in the traps and piping. What am I missing as to reasons why after all these years we still have to deal with the Drano, the plungers, the plumbers to clear out someone's huge dump and accompanying toilet paper clog?