Spray chemicals only kill what you see but Decke Termite Attack System eliminates the source. Each barrel contains cellulose with active ingredient in it. It goes into the ground around the house and intercepts termites before they can enter the house. The termites take the loaded bait back to their nest where they share it with all members. The active ingredient disrupts the termite's stomach thereby killing the queen, king and all other colony members. The source is eliminated forever.