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they have a cotton lining
It is unsulfured
Sterilized to ensure successful colonization without contamination
Easy to view level indicators keep nutrient levels exactly where they should be
20x21x1 Exact MERV 10 AC Furnace Filters 6 Pack Hydro Systems they have a cotton liningNordic Pure MERV 10 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, allergens and other contaminants are removed. MERV 10 furnace filters are comparable to HVAC filters with the rating of MPR 900 1000. While different companies