If your home or office building was built more than 40 years ago, there is a good chance that your sewer system includes cast-iron pipes. They were very popular because they are durable and very sturdy. However, cast-iron pipes are prone to developing heavy scales and corrosion in the interior of the pipe over time. If left untreated, these corrosions and its deposits will continue to grow, reducing the pipe’s efficiency and flow rate, and potentially causing a clogged drain and/or pipe degradation. The best way to fix the problem is to call an experienced sewer expert to treat the heavy build up and scales.