20x24x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack DUCTWORK Rinse the probe after use

Rinse the probe after use in fresh water and clean once a month to ensure the Commercial Truncheon Nutrient Meter remains accurate

and snaps together in minutes

From 1000 to 9990 ppm

Home Cultivation – Perfect for hobbyist and enthusiast home growers seeking commercial-quality results without the complexity

): 1 tsp – 2

20x24x 1/2 Half Inch Ring Panel MERV 12 Furnace Air Filters 6 Pack DUCTWORK Rinse the probe after useNordic 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