20x20x4 (3 5/8) Pleated MERV 7 Air Filters 2 Pack pest-and-disease-control General Applications – Apply 1

General Applications – Apply 1 or 2 pouches per listed site per 100 sq

Recommended for using the ILUMINAR Lighting Touch+ Controller

The built-in flow restrictor is intentional — it ensures adequate contact time between the water and the filtration media for maximum chlorine and chloramine reduction

When operating higher amperage units

(6) 6' Soil Probes

20x20x4 (3 5/8) Pleated MERV 7 Air Filters 2 Pack pest-and-disease-control General Applications – Apply 1Important 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