30x32x1 Exact MERV 8 AC Furnace Filters 6 Pack Terp Derp The active ingredient in RootShield

The active ingredient in RootShield Granules is a patented fungus

Equally at home in single or multi-tier cultivation environments

Works with 250w through 1000w wattage bulbs and ballast

Just add what's required to reduce pH

30x32x1 Exact MERV 8 AC Furnace Filters 6 Pack Terp Derp The active ingredient in RootShieldNordic Pure MERV 8 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores and other contaminants are removed. MERV 8 furnace filters are comparable to HVAC filters with the rating of MPR 800. While different companies use different scales to measure the air filters