Drain line jetting is a high-pressure cleaning method for blocked drains and sewer pipes. It works by pumping water through a high-pressure hose fitted with a jetting nozzle. The main causes of commercial drain line blockages are grease, sludge, sand, and debris. Drainage maintenance services help you to clear this sediment by breaking up sludge and debris, emulsifying grease and penetrating the same, roots pulverizing and flushing out the system.