Independent Tests prove that Mastic Alcoa's product really works, it is proven 100% effective against leaves, twigs, pine needles, & small debris. The product itself is strong and durable. Leaf Relief can handle up to 301 inches of rainfall per hour, based on a 20-foot run. Independent tests were conducted by Architectural Testing & Intertek Testing Services, NA LTD.
Leaf Relief Never Clogs, Never Overflows, Virtually Eliminates Call Backs, & fits all standard gutters.