Another common bathroom plumbingproblem is a clogged shower drain. This can be caused by soap scum, hair, and other debris accumulated over time. Often, a plunger will do the trick to clear the clog. Or you can use a manual plumber snake. Often caused by soap scum and hair, a slow sink drain is easy to remedy with a plunger, hot water, and these other clever solutions. Learn effective solutions for fixing a clogged toilet quickly and easily, including tools and techniques to prevent future blockages. Learn howto easily fix common toilet problems such as a toilet that runs intermittently, a toilet that flushes slowly and a clogged toilet. How Your Home’s Sewer System Works. The Difference Between a Normal Clog and a Sewer Line Problem. Tree Roots Are a Major Cause of Sewer Line Blockages. Grease Buildup Can Restrict Sewer Flow. Unfortunately, this plumbing component is susceptible to clogs. What causes the clogs? Anything from tree branches to dead squirrels — whatever can fit in the pipe. Depending on the severity of the clog the water level on your toilet can be affected since air simply isn’t getting through.