Filter Flow K Style Gutter Filters are a polyether foam filter insert that are guaranteed to prevent leaves, twigs, pine needles, sticks and other large debris from collecting in your rain gutters and downspouts. Made from polyether, this durable, innovative foam is built for the outdoors and offers comprehensive protection at an affordable price.

Our Filter Flow gutter guards are specially treated to prevent mosquito breeding and infestation, plus they have 60% higher force stability than similar products on the market.

Filter Flow gutter guards are hidden from plain sight and can not be seen from the ground. They do not penetrate the roof and work on just about any type of gutter and roof application.

The Filter Flow Gutter Filter comes with a 5-year performance warranty. For more comprehensive protection, the Filter Flow XT Gutter Filter features a 25-year performance warranty.