21x21x1 MERV 12 AC Furnace Filters 6 Pack Water Pumps & Irrigation Supplies These professional hydroponic nutrients contain

These professional hydroponic nutrients contain

space-saving format — expand to full 5″ × 5″ × 5″ with just water

Keeping the filter clean will ensure efficiency and longevity

Several strains that produce plant vitamins

Keep out of reach of children and animals

21x21x1 MERV 12 AC Furnace Filters 6 Pack Water Pumps & Irrigation Supplies These professional hydroponic nutrients containNordic Pure MERV 12 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 12 furnace filters are comparable to HVAC filters with the rating of MPR 1500 1900. While different