20x26x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Nutriants No additional additives required

No additional additives required

1/2 teaspoon

CFM 1708 at 0wg

Can be used as a harvest aid for cotton

Some cultivars and growing conditions may require higher doses of Calcium

20x26x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Nutriants No additional additives requiredNordic Pure Custom MERV 13 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