Monotub Adhesive Filter Disks (6-Pack)

Take the guess work out of the air exchange equation with our new Polyfil filter disks. Constructed from a durable 2.25″ plastic ring and 3M adhesive back, these disks have the perfect flow rate and density to allow the right amount of air exchange for monotubs or any bulk casing style grow. They keep humidity in and allow for the high levels of air exchange needed for any tub or greenhouse. Simply peel and stick over any size hole up to 2.0″ diameter. Can also be re-used!