18x18x1 Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Pack light a naturally occurring compound found

a naturally occurring compound found in soil

Includes 3' remote sensor with a control range of 50°F–115°F

Single use so that fresh solution is always used for accurate calibration

Versatility for any growing environment

The black base prevents light penetration to the root zone and reduces the chance of root disease

18x18x1 Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Pack light a naturally occurring compound foundNordic Pure 18x18x1 MERV 12 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer. This results in less flow restriction and 33% more surface area for cleaner smelling air. It will help eliminate unwanted odors as well as trap most airborne dust and particulate matter for fresh, clean air. Odorous gases and vapors (VOC) are attracted to and held by the activated carbon material