Borate - solid rods
Borate Rods are molded from water-diffusible borates and are highly concentrated for maximum efficiency. When inserted into decaying wood or wood in high risk areas, borate rods diffuse very slowly and provide a controlled and long lasting release of borate preservative...helping to protect against rot and insects.
Bor8 Rods and Cobra Rods are the two major manufacturers of Borate rods.
The primary difference is the Cobra Rods have added a 'Copper Hydroxide complex' that give the rods a dark green color.