21_1/2x23_3/8x1 Exact MERV 7 AC Furnace Filters 6 Pack king shredder Can be used alone or

Can be used alone or in conjunction with any feeding regimen

Very good drainage

These GrowoniX

magnesium and other vital elements

21_1/2x23_3/8x1 Exact MERV 7 AC Furnace Filters 6 Pack king shredder Can be used alone orNordic 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