20x25x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack ph-ec-tds-meters-and-solutions Optimal for flowering but can

Optimal for flowering but can be used for Veg as well

Larvae feed on soft-bodied insects including Aphids

This design will not far too concentrated in the middle of the growing area which results in stunted plant growth and sunburning

Lotus Pro Series Carboflush is designed to remove excess nutrient buildup stored within plants and medium

20x25x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack ph-ec-tds-meters-and-solutions Optimal for flowering but canImportant 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