20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 1 Pack AIR FILTER BOXES meaning it has three times

meaning it has three times the amount in each pellet as Sluggo (1% iron phosphate)

indoor/outdoor nurseries

Meters can be recalibrated

This enables you to control up to 1000 fixtures on one EL2 controller

Aquaponics

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 1 Pack AIR FILTER BOXES meaning it has three timesImportant 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. We also carry 4 7 8 and 5 1 4 inch depth filters,