These filters are used to fill one-inch gas exchange holes on a monotub during the fruiting phase of your substrate. These synthetic plug filters keep contaminants out of your monotub and simultaneously allow for ample gas exchange during the fruiting phase. Alternatively, during the substrate's colonization phase, our monotub plugs should be used since gas exchange is not beneficial to the colonization process.
These monotub filters can be used on our inflatable monotub or on any other monotub with 1" gas exchange holes.
Sold individually (1 filter).