Prevent contamination and minimize your time in building monotubs. These durable polyfil filters have an adhesive backing to cover holes up to 3” and are easy to apply. The filter discs are designed to maximize air flow and humidity to make the process of growing much easier and controlled.
 
Features & Includes:
 
10 Polyfil filter disks
3″ diameter disk
Covers holes up to 3″ diameter
Installs in seconds to any plastic container or Greenhouse!
Custom manufactured to our specs!
Filters and regulates air exchange
Reusable!