A plumber is an expert in doing what they do, which means that they can sometimes be a little expensive. Since they’re expensive, you will likely try to avoid calling a plumber in order to save money. In certain situations, that might be a good choice. You can often remedy plumbing problems yourself with a little bit of DIY skill. However, there are some situations that require the attention of a professional. Discerning between the two can be difficult to an untrained eye. Here are some situations that require a professional.