14x22x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack tents-&-tarps and Perionyx excavatus — each

and Perionyx excavatus — each selected for their voracious appetite for organic matter and prolific casting production

making it safe for repeated use in the same growing area

Three different non-linear EC-to-TDS conversion factors (KCl

Coverage will vary based on application rate

14x22x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack tents-&-tarps and Perionyx excavatus — eachNordic 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