In this episode, Steve discovers the greedy cup siphon hiding inside your loo, Matt delves into Joseph Bazalgette’s calculations for London’s sewer system and Helen teaches everyone how to flush a toilet, through the medium of song:

- Steve's bit (00:48 )

- Helen's bit (11:48 )

- Matt's bit (28:03 )

SHOW NOTES: 

Unfortunately our show notes are too big for Acast's margins to contain... head to the episode page to see everything.

Corrections and clarifications:

- None, so far. But we have been sent some fantastic sewer tour suggestions, and a range of toilet flush photos from around the world, so we've updated the episode page with all of that.

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