20x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack bloom Inoculate at any time throughout

Inoculate at any time throughout a plants' life with KALIX stage-specific microbe blends

magnesium & manganese

The Black Hatch can be used in a variety of ways

The SuperPonics 16-Plant Hydroponic Grow System grows your plants up to 5x faster

FULL HUMIDITY CONTROL – The two large top vents and two smaller side vents are adjustable and give you total control of the humidity levels in the plants’ environment

20x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack bloom Inoculate at any time throughoutImportant 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