20x22_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Lighting Accessories UL Certified

UL Certified

Similar to their amendment and microbial tea they fortify the mix with fossilized kelp and inoculate with endo/ectomycorrhizae

Athena Mildew Control is a complete mildew control system that destroys and prevents mildews on contact and further prevents the colonies from developing into a crop destroying scenario

What's the difference between the three species in the mix

this non-selective

20x22_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Lighting Accessories UL CertifiedNordic Pure Custom MERV 12 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