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check filter alert and a 24-hour timer
Additive/catalyst to nutrient regimens
The use of a spreader/sticker is encouraged to aid in the efficacy of this product
Silica also allows for better root development and faster growth
Each seam is double stitched with extra strong nylon thread
20x23x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Garden Hygiene and Safety check filter alert and aNordic 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
