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snow-white particle of perlite is sterile with a neutral pH and contains many tiny
Exacting N-P-K ratios are calibrated to meet the nutritional requirements of the mother plant
Important Note: Almost all furnace air filters have a different Actual Size (the exact dimensions) than Nominal Size (the name)
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5 in starter plug
21x21x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Hydro Systems snow-white particle of perlite isNordic 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
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