18x27x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack Environmental Controllers #4 Perlite (1/3" - 3/4"

#4 Perlite (1/3" - 3/4" granules)

if one of the many essential trace elements is deficient in the soil

Prefilter: Included

Roots Organics Extreme Serene is a natural source of growth-promoting nutrients and botanical extracts

18x27x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack Environmental Controllers #4 Perlite (1/3" - 3/4"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.