20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 12 Air Filters 4 Pack tents-/-indoor-greenhouses Organic materials and inorganic minerals

Organic materials and inorganic minerals are the most common impurities found in distilled and tap water

Each tray of cubes also includes a complimentary 15 ml packet of Clonex Rooting Compound Gel

To ensure the best results

miticide and fungicide that controls numerous diseases as well as insects and mites

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 12 Air Filters 4 Pack tents-/-indoor-greenhouses Organic materials and inorganic mineralsImportant 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,