15x25x1 Exact MERV 12 Plus Carbon AC Furnace Filters 12 Pack Hydroponics The S50 digital display shows

The S50 digital display shows exact ppm readings down to 1 ppm resolution

This biopesticide works by introducing bacterial spores and toxins into the body of the insect larvae as it feeds on foliage

Calcium Ca++ (ppm)

Using the handy

15x25x1 Exact MERV 12 Plus Carbon AC Furnace Filters 12 Pack Hydroponics The S50 digital display showsNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.