The Gutter Filler acts as a gutter machine – keeping your gutters free of harmful leaves, pine needles and other debris. Gutter Filler’s built-in biocide protection inhibits mold, mildew and fungus. This is not a surface coating or additive, or a temporary treatment, so it will not wash out or wear off…EVER! What a gutter machine! There is no need for regular cleaning or maintenance because it never allows debris into the gutter! Our material’s porous surface allows air to get underneath any debris and dry it out quickly. This debris is exposed to the wind and blows away easily. E-mail Todd@GutterFiller.com for more information on this fabulous gutter machine or visit our web site at www.GutterFiller.com.