20x25x4 (3 5/8) Pleated MERV 12 Air Filters 6 Pack propagation trays Ingredients: 50-60% aged wood product

Ingredients: 50-60% aged wood product

And the result is a better harvest

Temperature chart of the actual pH value at various temperatures printed on each bottle

Auto calibration & pH temp

20x25x4 (3 5/8) Pleated MERV 12 Air Filters 6 Pack propagation trays Ingredients: 50-60% aged wood productImportant 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