A highly concentrated solid formed, water-diffusible borate rod created from compounds of boron, a naturally occurring preservative element. The rod combines with water to become boric acid, which has long been recognized as a natural inhibitor of decay-causing fungi and insect infestation. Once the Impel rod is inserted into damaged log ends, it remains inactive until moisture in the wood increases at which time it slowly dissolves and the moisture stream carries this fungicide along the wood fiber paths to saturate the rotting areas. When the wood dries and moisture levels drop below approximately 25%, the preservative becomes dormant and provides a reserve that is ready to reactivate should decay-conducive conditions reoccur.

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