The second part of the video demostrates with the product installed while having a significant amount of leaves on the roof line again as you can see the leaves blow off quite easliy with a very inexpensine leaf blower. Once your eavestroughs are cleaned out and this product is installed you will not have clogged troughs or downspouts. When downspouts are clear there is very little chance for ice damming to occur so snow damage is also prevented during the winter months as well.No more nesting of birds, hornets, wasps, yellow jackets plus the number one breeding area (your eavestroughs) for Mosquito's has now been eliminated year after year !!