20x23x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack new_additions but worm castings brewed into

but worm castings brewed into a tea are excellent for hydroponic root drenches and foliar applications

Designed specifically for the horticulture industry

Using Cleanse in a recirculating or DWC system helps break down materials with lower solubility ratings

compact growth

20x23x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack new_additions but worm castings brewed intoNordic 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