17x19x1 Exact MERV 7 AC Furnace Filters 12 Pack Pots and Containers The granules can be used

The granules can be used for seed starting to mature plants

The HI 763100 is a digital conductivity electrode with a built in temperature sensor

bodily fluids and blood borne pathogens

Water based and non-toxic to plants

17x19x1 Exact MERV 7 AC Furnace Filters 12 Pack Pots and Containers The granules can be usedNordic Pure MERV 7 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores and other contaminants are removed. MERV 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters