20x24x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack Amendment Safe to use as often

Safe to use as often as necessary during the growing season

controlling the fan in day and night modes separately

growth and vigor

and soon completely stop

Hydroponic Use: Add 1-2 oz per 5 gallons of reservoir water once to twice weekly

20x24x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack Amendment Safe to use as oftenNordic Pure 20x24x4 Pleated Air Filters MERV 12 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, virus carriers, bacteria, mold spores and other contaminants are removed. All Nordic Pure pleated air filters are manufactured using a heavy