8x8x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Water Filtration FDA Approved

FDA Approved

making it suitable for use in the production of high-quality extracts

Excellent for hydroponic nutrient testing

Exclusive "Zero" calibration feature—accurate to 2%

Test pH every few drops until the desired pH level is reached

8x8x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Water Filtration FDA ApprovedNordic Pure Custom MERV 14 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