16_1/4x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Controllers a jar test is highly

a jar test is highly recommended before applying this product

Always use equal parts of Athena Bloom A & B to maintain proper mineral ratios

giving your plants a clean

Storm flap over zipper with pressure sensitive tape adds an extra layer of protection

16_1/4x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Controllers a jar test is highlyNordic 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