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Perlite: maintains air space for optimum root growth
This product is made in the USA
An essential product that no grower should be without
This aggressive formula contains proprietary blends of calcium and balanced levels of magnesium to ensure that plants thrive
20x25x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack Aeromixer Perlite: maintains air space forImportant 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 20x25x4 filter
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