BC Charcoal filter with twist lock 

BC Northern Lights changed the charcoal filter attachment a few years ago for the BloomBox and Producer. 

This new configuration provides a push and twist-lock connection rather than having to use a clamp to hold it in place.

Other than the connection update, the BC Activated Coconut Charcoal filter is the same as the previous model and still fits a 4-inch duct.

These cylinders of Activated Coconut Charcoal are a very popular method for neutralizing nutrient odors.

Depending on the use, these filters will clear the air of growroom odors for approximately 1 to 2 years. Filter not exactly as pictured above.