20x24x1 Furnace Air Filters MERV 8 Pleated Plus Carbon 12 Pack Promote Length 12 13/16"

Length 12 13/16"

It is what frees up phosphorous for plant use

58” length

Athena CaMg is particularly useful

20x24x1 Furnace Air Filters MERV 8 Pleated Plus Carbon 12 Pack Promote Length 12 13/16"Nordic Pure 20x24x1 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer. This results in less flow restriction and 33% more surface area for cleaner smelling air. It will help eliminate unwanted odors as well as trap most airborne dust and particulate matter for fresh, clean air. Odorous gases and vapors (VOC) are attracted to and held by the activated carbon material