The final episode in the series begs the question, who would flush a pair of designer underpants and how big can a fatberg be? For Chris and Mark a pair of pants is just one of many treats they get on a weekly basis as they maintain Lennox Gate Pumping Station in Blackpool. Whilst, over in Davyhulme, Scott and Wayne face an estimated 100-tonne fatberg, an eye watering sight and smell but all in a day's work for the lads who handle these gut-wrenching jobs.

It's a sad day for many as asset manager Joe gets ready to retire after 42 years in the company, and it's the end of an era for the dream team Andy and Terry, as Andy prepares to move job. Elsewhere a giant mixer is put in place to deal with an algae problem in Heaton Park reservoir, and call centre manger Rachael, who has been distributing jobs to teams out in the field for over eight years, is about to have her first taste of life as a waterman. From job interviews to blocked drains and giant fat-sucking hoovers, we bid farewell to men and women who keep the water flowing. Show less