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Phosphorus is particularly beneficial during the early rooting stage but also provides energy during fruit and flower production
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16x20x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 6 Pack double-ended Phosphorus is particularly beneficial duringImportant 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 16x20x4 filter