21x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_hrg and its spectrum is 45%

and its spectrum is 45% more efficient for photosynthesis than HPS

Nordic Pure 12x25x2 MERV 12 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

Cover all foliage completely and repeat applications as needed to maintain control

Our clever pH controller automatically monitors and fine-tunes the pH levels for you

21x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_hrg and its spectrum is 45%Nordic 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.