20x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack Commercial Lighting No 4 Perlite features LARGE

No 4 Perlite features LARGE and BULKY particles which maximize nutrient uptake

Inject bag with 10 ccs of liquid culture

As a rootdrench or general surfactant spray 1

0 inches H6

When the original DiST (Dissolved Solids Tester) was first introduced

20x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack Commercial Lighting No 4 Perlite features LARGENordic 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.