Before a complete blockage
Signs of a possible drain line backup
Gurgling, unpleasant drain odors and fixtures emptying more slowly than usual can accompany a developing restriction. A fully backed-up sink, tub or toilet is a clearer interruption, but the visible fixture does not always identify where the problem lies.
Mention whether the symptoms occur together and whether using one fixture affects another. Include a recent clearing attempt and how long any improvement lasted. Avoid repeatedly using a drain that is overflowing or sending wastewater back into the room; report that condition when requesting help.
