20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack HPS Cocogro has excellent drainage properties

Cocogro has excellent drainage properties and can be used over a longer period of time than coir fiber with shorter fibers

Just add what's required to raise pH

no deficiencies

Life Cycle: Mated adult females may overwinter in plant crevices or other protected areas if prey is available in the fall

and #8 Perlite (3/4"-1 1/3" granules)

20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack HPS Cocogro has excellent drainage propertiesImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3 8 depth 20x20x4 filter