A slow draining shower is usually due to a clog in the pipes. Over time, hair, dirt, and soap buildup will accumulate in a shower drain. This issue is even more common for those with long hair since the length prevents water and debris from draining completely.In other cases, a clogged vent pipe may be to blame. Because vent pipes open up at the rooftop, they may become clogged by sticks and leaves over time. While this is a less common cause of slow shower drains, our plumber can determine if this is the issue after snaking the drain.