16x20x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 6 Pack shoe-cover Minerals remaining in solution increase

Minerals remaining in solution increase the conductivity of the water

Voltage 120V or 240V

Hydrologic's reverse osmosis filter tubing in black

it will automatically maintain ideal CO2 levels for optimum growth

16x20x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 6 Pack shoe-cover Minerals remaining in solution increaseImportant 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