12x20x2 Furnace Air Filters MERV 12 Pleated Plus Carbon 3 Pack spl_cg For hydroponics use 2 teaspoons

For hydroponics use 2 teaspoons of mycorrhizal fungi for every 10 gallons of tank reservoir

usable depth is 26

Bubble Magic puts the EXTRA into Extract

Also works with the 50 series kits

12x20x2 Furnace Air Filters MERV 12 Pleated Plus Carbon 3 Pack spl_cg For hydroponics use 2 teaspoonsNordic Pure 12x20x2 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