16x20x4 (3 5/8) Pleated MERV 13 Air Filters 1 Pack X Nutrients bloom Includes both Wet and Dry

Includes both Wet and Dry Quantanium Coated Tumblers

Kelp (Ascophyllum nodosum)

Centurion Pro 1

Calibration of pH can be with 2 or 3 points

Generator-ready

16x20x4 (3 5/8) Pleated MERV 13 Air Filters 1 Pack X Nutrients bloom Includes both Wet and DryImportant 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