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All Covert Filters come with a reusable pre-filter that will filter out the large particles before they enter the carbon bed which significantly extends the life of the virgin activated carbon
Bacillus licheniformis – 525
HP2 is pure phosphorous from liquid bat guano
Overhead Series
The mini-SCRUB is perfect for those who add expensive beneficial biological organisms to their grow media
Active Air In-Line Booster Fan Fan Size:6" Fan All Covert Filters come withActive Air Booster Fans can be mounted in line with your existing duct work to increase airflow. Available in 6", 8" and 10" models. They are quiet running, are made with UL recognized components, and include an 8', 120v power cord.
