14x16x1 MERV 7 AC Furnace Filters 6 Pack rock-bottom Visible improvements in root mass

Visible improvements in root mass and plant vigor are typically observed within 2–4 weeks

Covers the porthole so that evaporation of the nutrient solution is minimized

40% Water Soluble Magnesium

This guarantees absence of heavy metals or other contaminates

14x16x1 MERV 7 AC Furnace Filters 6 Pack rock-bottom Visible improvements in root massNordic 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