28x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack beneficial microbes Best results will be achieved

Best results will be achieved by making more frequent applications every 2 to 3 weeks rather than increasing the concentration of the spray solution

5" X 20'' CF-4520-CC Replacement Carbon Filter for the EX600-4000-HFT (Tall versions)

The soul of every plant resides in the roots

Handling capacity of up to 2lbs of synthetics per gallon of water

28x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack beneficial microbes Best results will be achievedNordic 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