Active Air Pre-Filter, 6"x16" Pre-Filter:Active Air Pre-Filter, 8"x24" you create the vigorous enzymatic

you create the vigorous enzymatic environment your roots need

3 to optimize nutrient availability

Triacontanol is not found in many products

The trend indicator icon is located above the comfort index icon and to the right of the temperature display

Active Air Pre-Filter, 6"x16" Pre-Filter:Active Air Pre-Filter, 8"x24" you create the vigorous enzymaticMake the most out of your Active Air filter with a corresponding Active Air pre filter. Find the matching size from our large collection! Why choose Active Air filters? All filters are maintenance free and feature long lasting activated virgin charcoal that keeps your air odor free. Inside each filter, the charcoal is carefully packed to ensure consistent and even air flow throughout the carbon bed for full use of the filter. Stock up on pre filters