18x22x1 MERV 7 AC Furnace Filters 12 Pack hydro-x • Required for nitrogen fixation

• Required for nitrogen fixation and root nodules

and robust stalk and root growth

Mushroom Flies

replaceable double junction pH probe and temperature probe (for pH ATC)

The high efficiency S4 spectrum provides ideal conditions for both human and plant health to deliver better working conditions and consistent crop quality

18x22x1 MERV 7 AC Furnace Filters 12 Pack hydro-x • Required for nitrogen fixationNordic 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