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Once or twice a year you should use a root killer in your drain line. Tree roots can do major damage to your main drain. Tree roots can break older drain pipe causing thousands of dollars in repairs.

Tree roots searching for water are as fine as hair, working their way into the connections in drain pipe. Inside the pipe, they have a great source of water and nutrients. Once they find the water source they will grow and expand, damaging pipe and causing a blockage.
By applying a root killer once or twice a year, you can keep drain lines open and root free.