21x21x1 Exact MERV 8 AC Furnace Filters 6 Pack Grow1 5' Steel Stake Economy Flood Trays are made

Economy Flood Trays are made from high-quality ABS plastic that are crack resistant and contain UV inhibitors to prevent them from breaking down under natural or artificial lighting

Safety Certified and IP65 Rated

not all iron ion sources are created equal: Elite CalMag contains a special chelated iron that improves bio-availability of iron to the plant

Ultra-fine

and controllability

21x21x1 Exact MERV 8 AC Furnace Filters 6 Pack Grow1 5' Steel Stake Economy Flood Trays are madeNordic Pure MERV 8 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 8 furnace filters are comparable to HVAC filters with the rating of MPR 800. While different companies use different scales to measure the air filters