16_3/8x21_3/8x1 Exact MERV 14 AC Furnace Filters 6 Pack Steel stake They are white until they

They are white until they feed after which they take on the coloration of their prey (usually red or brown)

Applications include hydroponics

Daisy Chain Capable

This specialty formula reestablishes beneficial organisms in and around the root zone to stimulate root development

16_3/8x21_3/8x1 Exact MERV 14 AC Furnace Filters 6 Pack Steel stake They are white until theyNordic Pure MERV 14 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 14 furnace filters are comparable to HVAC filters with the rating of MPR 2800.