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This thriving colony of Ulocladium oudemansii provides protection from pathogens to fruit
The strategic addition of just the right amounts of calcium and magnesium actually displaces sodium and excess potassium
Noise (dB) - =56dB
20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 4 Pack grow media How to Apply:Important 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,