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5 (500 ppm) or 0
Manufactured for continuous duty and years of trouble-free use
When a plant goes into a fruiting cycle
Quick CAL mode for a speedy
This automatically maintains the ideal nutrient level in all the interconnected units
13x23x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack pest-and-disease-control 5 (500 ppm) or 0Nordic Pure Custom MERV 12 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
