20x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 6 Pack eligible-for-discount Works with timers or controllers

Works with timers or controllers

and higher yields

5" dome gives extra height for your taller cuttings

EZ CO2 is a natural safe and inexpensive way of providing your plants with carbon dioxide (CO2)

The GROW1 Inline KDF-85 Garden Water Filter removes chloramine

20x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 6 Pack eligible-for-discount Works with timers or controllersImportant 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 20x20x4 filter