21x21x1 MERV 13 AC Furnace Filters 6 Pack Nutrients and Supplements 4 x 11 x 15

4 x 11 x 15

plug and play"

This easy to use amendment can be applied to soil or coco growing media for an extra boost to your nutrient uptake

Heavy duty and reusable

21x21x1 MERV 13 AC Furnace Filters 6 Pack Nutrients and Supplements 4 x 11 x 15Nordic Pure MERV 13 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200