16x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 1 Pack X Nutrients Grow Spray 1 Gal Now with 15% more perlite

Now with 15% more perlite in every bag

For use in hydroponic

Bacillus amyloliquefaciens is an aggressive and effective fighter against bacterial and fungal pathogens that try to infringe upon the root systems it colonizes

Precision German glass filter lens with our patent pending Rendition Perfect Color HPS technology

16x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 1 Pack X Nutrients Grow Spray 1 Gal Now with 15% more perliteImportant 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