Active Air Pre-Filter for ACCF3912, 12" x 39" nutrient-combo calibrate the meter using the

calibrate the meter using the included 4

ZeroTol HC has the ZeroTol name and research behind it

controls gnats at different points of their lifecycle

Includes a smart controller with dynamic climate and time-based programming

Active Air Pre-Filter for ACCF3912, 12" x 39" nutrient-combo calibrate the meter using theDescription Active Air Pre filter: Extend the effective life of your Active Air carbon filter with a corresponding Active Air pre filter. These pre filters block large particulate matter, such as dust and dirt, from clogging the working surface of your filter. This optimizes your carbon filter to operate at top efficiency for an extended period. When the pre filter shows visible signs of dirt and discoloration after several weeks, it simply needs a