17_1/2x23_1/2x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack cloning-and-seed-starting Never mix any of these

Never mix any of these nutrients together in their concentrated form

soil reviving fertilizer

40% Water Soluble Magnesium

1 Gal) Tank Capacity

17_1/2x23_1/2x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack cloning-and-seed-starting Never mix any of theseNordic Pure Custom MERV 7 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