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Package Quantity:1 Â Â Size:1 lb. Product Description. Foaming Root Killer contains Dichlobenil which kills the roots and prevents new growth. New root growths from outside the pipe joints are retarded or inhibited when they come in contact with the Dichlobenil inside the pipe. Foaming Root Killer self foams on contact with water. The foam acts as a carrying agent, putting the active ingredient in contact with the tree roots above the flow. Easy to use. This is an economical solution to a potentially, very costly problem. Not for sale out of the contiguous U.S. Banned for use in septic systems in Florida due to State Regulations. From the Manufacturer. Foaming Root Killer is a new patented product which foams on contact with water to fill the entire pipe line with the root killing agent dichlobenil. Foaming Root Killer is recommended for severe recurring root problems. Not for sale out of the contiguous U.S. Banned for use in septic systems in Florida due to State Regulations.. Roebic FRK Foaming Root Killer, 1-Pound. Roebic FRK Foaming Root Killer, 1-Pound. Roebic Laboratories