Household plumbing comes to the formula of pipes, fixtures

https://canvas.hms.harvard.edu/eportfolios/641/home/what-causes-blocked-drains-in-your-plumbing-system

Household plumbing involves the machine of pipes, furnishings, and fittings mounted for water distribution and waste removal in residential constructions. Proper protection guarantees green operation and prevents highly-priced upkeep.