After my boyfriend tried several variations of chemical drain opener without success (the water barely trickled down the drain), I was tired of sending harsh chemicals down the drain without noticeable effect. The commercial chemicals were not cheap; I decided to try a natural alternative.
With a little research, I discovered much like the volcano experiment of elementary science, a drain can be unclogged using baking soda and vinegar. The combination of a base and acid loosen the nasty bits clogging the drain.
I shook the suggested 1/2 cup of baking soda down the drain and poured 1/2 cup of white vinegar after it. The concoction immediately bubbled. After twenty minutes of bubbling, I poured hot water into the drain.
Lo, and behold! The drain worked much better. I did the experiment again; this time it loosened it enough for me to remove the drain stopper and the hair blob stopping the water's passage. I followed this with one time and the drain has worked perfectly ever since.