Clogged drains are a simple household plumbing trouble which will lead to water backups and unpleasant odors

https://canvas.curtin.edu.au/eportfolios/1050/home/warning-signs-of-plumbing-problems

Clogged drains are a elementary domestic plumbing subject that will result in water backups and disagreeable odors. Regular cleaning and applying strainers can aid ward off clogs from forming in the first location.