A blocked drain is one of the most common plumbing problems that can happen at home. If your bathroom or kitchen has a clogged drain, it can be a headache and create a major mess. Some of the plumbing problems caused by blocked drains are slow draining showers or bathtubs, and washers and dishwashers are unable to complete their cycle. Nobody likes the idea that you're having a hot shower with the water in your bathtub.