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Many studies of damaged sewer lines reveal that root intrusion is a common cause of flow problems. It is no secret that roots require water and thrive in its presence. Roots sense water even at great distances and are virtually undeterred in their quest for it. The sewer maintenance field is continually plagued by this problem. Roots are generally not stopped for long by conventional sewer line joints, no matter how carefully and efficiently they are constructed. Vapor leaks at the top of an otherwise water-tight joint will encourage microscopic growth. As cells multiply, roots grow rapidly. Nourished by the sewage flowing within the line, a blockage in the line can soon develop. Cutting out the roots does not solve the problem because they generally grow back thicker and stronger than before.
The most acceptable solution to the problem of root invasion into subsurface lines is a root growth inhibitor, 2, 6, dichlorobenxonitrile (dichlobenil), that may be mixed with AV-100 Chemical Grout and AV-118 Duriflex. Tests have shown that a concentration of 100 ppm of dichlobenil in the grout will stop root intrusion into the sewer line for two years and longer.
No product other than dichlobenil has been accepted by the sewer grouting industry for root treatment. Other chemicals have been suggested and field tested without much success. The best known of these is copper sulfate. Copper sulfate is not recommended for use with AV-100 Chemical Grout and AV-118 Duriflex as a root inhibitor in sewer pipe joints. |
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