16_3/8x21_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_spectrumking @ 120V = 5

@ 120V = 5

and especially as it can help prevent Neck rot in cucumbers and blossom end rot or split fruit in tomatoes

Organic & Conventional Compatible – Approved for use in both certified organic and conventional growing programs

Mint Oil – Secondary active ingredient

Active Aqua’s chillers are environmentally friendly (they use R134a refrigerant) and are ideal for keeping the nutrient solution in your reservoir at the perfect temperature

16_3/8x21_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_spectrumking @ 120V = 5Nordic Pure Custom MERV 13 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