21x21x1 MERV 13 AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions Well suited for low-light growing

Well suited for low-light growing conditions and high humidity

Taped seams offer an extra layer of protection by preventing contaminants from entering or seeping through exposed seams

Sclerotinia sclerotiorum and Monilinia spp

This revolutionary application method overcomes the two largest problems with spraying your flowers:

This product is corrosive and a strong oxidizing agent

21x21x1 MERV 13 AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions Well suited for low-light growingNordic 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