16x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack timers-and-instruments Each Nordic Pure 4” MERV

Each Nordic Pure 4” MERV 7 air filter captures airborne particles as small as 3

View readings from your PC or mobile device so you'll know when to adjust your nutrient solution to the optimal range

Good 2 Grow trays and reservoirs are both made of durable high-impact white ABS plastic with UV resistance for improved longevity

pH Down™

This results in up to 40% greater trichome preservation during the trimming process

16x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack timers-and-instruments Each Nordic Pure 4” MERVNordic 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