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Frequently Asked Questions

A: The roots are killed on the day of root control treatment. However, this is not the same as seeing the results. Root decay depends on many factors, including type of tree, mass of roots, and flow conditions. After months of decaying, the root may or may not be gone, but it will not be able to support a stoppage.

A: Cutting of tree roots is only a temporary solution. When roots are cut out of the pipe they grow back quicker and heavier, eventually destroying the pipe. As a result, the long-term costs of replacement or relining due to the use of cutting will far exceed the cost of maintaining the sewer with chemical root removal treatment.

A: It is rarely necessary to clean a sewer before root control treatment. However, if tree roots are inhibiting the flow or causing the pipe to surcharge, the customer should cut them out before the treatment. Discuss this with your rep before scheduling treatment.

A: No, it will not have any adverse effects on the Wastewater Treatment Plant. It also will not disrupt the wastewater treatment process. The main ingredient in Razorooter® II, diquat dibromide, is EPA approved for aquatic use and is also used in ponds to kill algae.

A: No. The normal sewer flow will pass under the foam during application. The flow of wastewater may become slower temporarily, but will not cause a stoppage.

A: A very small percentage of the tree root system actually lives in the sewer pipe. The root control treatment will only kill the roots inside the pipe and approximately twelve inches outside the pipe. In fact, Duke’s guarantees not to kill any above-ground vegetation.

A: Production often depends on the sewer section size, location and the proximity to one another. On an average day with good weather, we can treat approximately 6,500 feet.

A: A typical 300-foot section of 8-inch pipe will take about 20-30 minutes to treat.
A: As the roots decay, some will slough off and fall into the flow and others will remain in the pipe. Because the decay occurs over time, the rate at which the roots fall off the pipe will be too gradual to cause a stoppage.
A: Whenever possible, we suggest leaving the line alone after root control treatment. However, if there is a concern for future blockages due to the line’s history, cleaning after treatment does not affect our warranty. If a line must be cleaned due to debris or grease buildup, it does not need to be retreated. However, if tree roots are the reason the sewer needs cleaning, it should be retreated. It is important to allow the roots in these sewers time to decay. To get the best results from a root control application, leaving the sewer line alone is optimal, as the cleaning process can remove bacteria in the line that help the decay process.
A: The initial root control treatment is guaranteed for two years. Lines should be retreated no later than 6 months after the expiration date. We will guarantee for an additional three years all lines treated upon the expiration date or within six months after the expiration date. From then on, treat every three years to keep your sewers under guarantee.
A: First relieve the blockage. Once the blockage is gone, call Duke’s to inform us that you had a blockage on a line under guarantee. We will schedule a re-treatment at no cost.
A: Duke’s will treat house lines when working for municipalities and sewer authorities but does not offer this service to individual homeowners. Duke’s can only treat house lines through an outside clean out, therefore no treatments are initiated from inside the home. In addition, it is common for the foam to travel up the house line ten to fifteen feet during a normal main-line treatment.


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