16x24x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack CO2 Bluelab pH Up Solution is

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a naturally occurring form of carbon drawn from prehistoric peat bogs

16x24x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack CO2 Bluelab pH Up Solution isNordic Pure 16x24x4 Pleated Air Filters MERV 13 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, smoke particles, smog, virus carriers, bacteria, mold spores and other contaminants are removed. All Nordic Pure pleated air filters are manufactured using a