17_3/8x35x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_dakine420 Monitor EC regularly and adjust

Monitor EC regularly and adjust accordingly based on the crop and growth stage

Because Roundup shouldn't be your only option

NPK: 5-0-0

We recommend that you change your AC air filter every 3 to 6 months

Our friendly customer service representatives will be glad to assist you

17_3/8x35x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_dakine420 Monitor EC regularly and adjustNordic Pure Custom MERV 8 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