13x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack plant-support HI11310 glass body refillable pH

HI11310 glass body refillable pH electrode with temperature sensor

With a steel core for strength

They have a higher blue spectral ratio enhancing Veg and growth

Length: 17

13x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack plant-support HI11310 glass body refillable pHNordic 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.