30x30x1 Exact MERV 7 AC Furnace Filters 6 Pack HPS then product may be applied

then product may be applied up to and including day of harvest

Aerorock is a much better alternative to perlite

and are sold for an even lower price

Holds less water for improved leaching of fertilizer salts during crop cycle

30x30x1 Exact MERV 7 AC Furnace Filters 6 Pack HPS then product may be appliedNordic 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