14x14x 1/2 Half Inch Ring Panel MERV 7 Furnace Air Filters 12 Pack spl_hrg or glued to any surface

or glued to any surface

black interior

The HI98115 features a replaceable HI1271 pH electrode that can be changed when needed without having to buy a new meter

HOW TO USE: Use Procision Advantage as a primary growing media or add to your custom mixtures

14x14x 1/2 Half Inch Ring Panel MERV 7 Furnace Air Filters 12 Pack spl_hrg or glued to any surfaceNordic Pure Half Inch Ring Panel AC Furnace Air Filters consist of an internal frame bonded between flat layers of two different types of electrostatically charged HVAC furnace filter media. The first layer is a high capacity, polyester filter material which acts as a pre filter, capturing large airborne particles. The second, more efficient, layer is a MERV rated smooth poly blend filter material. The electrostatic charge works as a magnet to draw in