as a rule i dont do much of this work i mainly fix central heating but.....
i got called to a blockage on an internal soil stack(shitpipe),
the house had 6 people in it and it had backed up to the upstairs loo...
i went outside and rodded back from the manhole.......spladoush!!!!
2 weeks worth of everything smelly coming my way!!!!
it filled and overflowed the manhole and went down the path!!!!

but as they say where theres muck theres money!!