18x24x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack stocked Calibration is simple with the

Calibration is simple with the push buttons on the meter and fresh Bluelab calibration solutions

the Humboldt Nutrients teams of agronomists and chemists have created Ginormous (0-18-16)

Encourage trees to grow to new height

The slide-out air filter compartment makes it very easy to replace

and after a rain or irrigation when deficiency symptoms are present or during growth periods when additional calcium is needed

18x24x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack stocked Calibration is simple with theNordic Pure 18x24x4 Pleated Air Filters MERV 15 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, smoke particles, smog, allergens, virus carriers, bacteria, mold spores and other contaminants are removed. All Nordic Pure pleated air filters are manufactured