Question
tree roots blocked the sewage drain and caused sewage to back up into my basement - how can i kill the tree and it's root system?

Answer
Unfortunately, if the flow through the sewer has been completely stopped by roots growing in your sewer lines, you don抰 have many options other than calling a plumber. However, if you begin to notice your toilet flushing sluggishly, you can restore the flow and prevent future stoppage by using copper sulfate to clear the blockage before it become complete. Copper sulfate will not only kill roots growing in the sewer line, but as an added benefit, it kills the organisms which produce offensive odors.

1.Measure out about one-half cup of medium sized copper sulfate crystals. Pour the crystals into the commode or toilet stool. Flush the toilet.

Step2 Repeat this procedure until the 2 lb. container is empty. Flush the toilet several more times to make sure the crystals are carried outside of your home and into the sewer line.

Step3 Leave the house for several hours to allow for any fumes that might result to dissipate.

Step4 Observe the flow of your toilet for the next several days. Copper sulfate does not work overnight. It requires several days to several weeks to kill the roots and it may take even longer for the dead roots to decay and break away, thereby clearing the sewer line and restoring proper flow from your toilet.

Step5 Repeat the procedure every three to four months using smaller amounts of copper sulfate to prevent the roots from growing back.