| For satisfactory results when using dichlobenil with AV-100 Chemical Grout and AV-118 Duriflex, the sewer line should first be cleaned and light root growth removed so the grouting packer can be operated easily and freely. All the joints in an entire section (between manholes) that has been invaded by roots should be sealed with AV-100 and AV-118 Duriflex containing dichlobenil. All manufacturer’s directions for using dichlobenil should be followed.
If root growth is heavy and well-developed , the joint space may be mostly filled with woody root material. In such cases, very little grout may penetrate the joint and the entire section between manholes should be pretreated with a solution containing vapam and dichlobenil in accordance with manufacturer’s directions. When root deterioration has been verified, usually after 9-12 months, the joints should then be grouted as described above. Do not add solutions containing vapam to any grout solution.
Dichlobenil becomes a suspended solid when mixed in a grout solution. To avoid settlement, continuous mixing is recommended. Dichlobenil mixed with an inert talc or clay will stay in solution much longer without mixing. A coarse (10-20 mesh) stainless steel filter should be used in systems employing filters to prevent removal of suspended particles.
The manufacturer recommends incorporation of 0.04% AC 50W in the grout mixture. To do this in a sewer grouting rig using two thirty-gallon grout tanks, add 0.2 pounds (3.2 oz) of AC 50W to about one gallon of water in a small container. Stir completely, and pour this mixed concentrate into the AV-100 or AV-118 Duriflex tank. This mixture gives a concentration of about 400 ppm in a sixty-gallon batch of AV-100 Chemical Grout or AV-118 Duriflex. |
