20x25x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 2 Pack DUCTWORK Potassium is a major component

Potassium is a major component in photosynthetic processes

PyGanic Specialty is the ideal choice for almost every grower

Flexible hanging options

RootShield Plus is also available in a granular formulation

Vital Oxide employs the power of Oxygen (in the form of Chlorine Dioxide) to create a fast-acting

20x25x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 2 Pack DUCTWORK Potassium is a major componentImportant 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 20x25x4 filter