21_1/2x23_3/8x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack biological fertilizer Application Rate:

Application Rate:

Factory Calibrated: The COM-100 meter is calibrated with a 1413 µS solution

Elite 91 SILICIC ACID –PLANT AVAILABLE BIOACTIVE SILICON

Alleviates transplant shock and other stress responses like high light and temperature

PCBs (organic chlorine)

21_1/2x23_3/8x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack biological fertilizer Application Rate:Nordic 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