21x23x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-light-ballasts This makes them especially useful

This makes them especially useful for hydroponic growing

Calcium amino acid chelate

capable of adding up to 1

• Sap groove keeps blades from sticking

This promotes explosive flower production

21x23x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-light-ballasts This makes them especially usefulNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.