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Research has shown that Leonardite is the best source for humic and fulvic acids because its biological activity is much greater than other sources of humic acid

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16_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack AC / Dehumidification / Humidification clean processed shoe covers offerNordic 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