using a plunger. when there is a problem with only one drain, there is usually only a problem with one of the smaller pipes in the drain system. this can be one of your easier problems to fix because the problems are usually easier to get to and are not that much trouble yet.
if it is a problem where say multiple toilets or multiple sinks are backing up, this could be a sign that you have bigger problems. this might mean that you have a clog deeper in the drainage system which is a harder issue to fix because usually the clog is larger and more severe. if your simple 