System Three Resins 644601123012 1-Pound Wood Care Systems Borate Powder Board defense borate powder is an EPA registered insecticide, termiticide and fungicide concentrate for control of wood destroying insects and rot It is a very versatile product for the protection and treatment of wood against all wood destroying organisms Board defense is a water-soluble white powder It can be used dry or in solution to form an effective penetrating solution Comes in 1-Pound bag