Most chemical drain cleaners are not recommended for main sewer lines. They often work by generating heat and using caustic ingredients that can weaken older metal pipes, harm some plastics, and still leave heavy grease or roots behind—especially in long, large-diameter lines. In a humid coastal county like Brevard, leftover blockages can quickly lead to standing sewage, strong odors, and even sanitary sewer overflows, which carry bacteria and viruses that pose health risks. Professional main line cleaning and hydro jetting remove buildup mechanically with water, providing more thorough, pipe-friendly results.