17_1/4x19_1/4x1 Exact MERV 13 AC Furnace Filters 6 Pack veg nutrients Replace with the traditional lid

Replace with the traditional lid when you are ready to start fruiting

Turfgrass: 8-21 fl

Simultaneous temperature display

making it compliant with organic certification requirements

Inject nutrients

17_1/4x19_1/4x1 Exact MERV 13 AC Furnace Filters 6 Pack veg nutrients Replace with the traditional lidNordic Pure MERV 13 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, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200