20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 15 Plus Carbon 4 Pack plant-care/pest-&-disease-control Full spectrum white and 660nm

Full spectrum white and 660nm red

previously thought wasted

The Bluelab calibration and conductivity standard solutions are essential for use with all Bluelab products for the calibration of pH and testing the cleanliness of the Bluelab Conductivity/Temperature probe

Use this combination to control a wide variety of Weevil and boring pest populations

No 4 Perlite features LARGE and BULKY particles which maximize nutrient uptake

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 15 Plus Carbon 4 Pack plant-care/pest-&-disease-control Full spectrum white and 660nmImportant 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,