Foaming Root Killer Dichlobenil which kills the roots and prevents fresh growth. New root growths from outside the pipe joints are or inhibited when they come in contact with the Dichlobenil inside the pipe. Root Killer self foams on contact with water. The foam as a carrying agent, putting the activistic ingredient in contact with the tree roots above the flow. to use. This is an economic solution to a potentially, very dearly-won. for sale out of the immediate U.S. Banned for use in abscessed systems in Florida callable to State Regulations.