GutterStuff®Pro is a polyether filter insert for 5” and 6” K gutters. It inserts into the gutter under the spikes or hangers and completely fills the space across the gutter to allow only water to pass through while leaves, twigs, and any other debris are prevented from entering the gutter. They simply dry up and blow off. Gutter Stuff®Pro sits snugly inside the gutter, unseen from street level. It is amazing in its effectiveness at sealing out debris, while allowing enormous volumes of water to pass through quickly and without overflow. Its inherent polyether property makes it inhospitable to fungus, mold and mildew; and because it fills the gutter it deprives birds, bees, and mosquitoes of some of their favorite breeding grounds. Gutter Stuff®Pro has been field tested for many years in all types of weather and under many types of debris conditions.