20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 4 Pack grow media The strategic addition of just

The strategic addition of just the right amounts of calcium and magnesium actually displaces sodium and excess potassium

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Natural & Organic Potting Mix is an all-purpose mix recommended for containers and raised beds and ensures good aeration

Steady supply of CO2 for 6 months guaranteed

Operating and routine maintenance has never been easier

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 4 Pack grow media The strategic addition of justImportant 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,