12x26_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Lighting Hygrozyme provides a cleaner root

Hygrozyme provides a cleaner root zone by accelerating the breakdown of dead root matter

Ultra thick at 7

Although it's active ingredients are corn and soybean oil

allowing for fast growth and strong

Available Phosphate (P₂O₅): 0%

12x26_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Lighting Hygrozyme provides a cleaner rootNordic Pure Custom MERV 14 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition