15x25x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack beneficial microbes Research has shown that Leonardite

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

The instrument is supplied with a light sensor connected by a fixed 1

to avoid this problem

Kelp Blast is a 100% soluble ascophyllum-nodosum kelp extract designed to be used throughout all stages of plant life

15x25x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack beneficial microbes Research has shown that LeonarditeNordic 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