28x32x1 MERV 13 AC Furnace Filters 6 Pack books-&-videos The high calcium content of

The high calcium content of Neptune's' Harvest Crab and Lobster Shell reduces the effects of fungal diseases such as blossom end rot and helps plants develop healthy

Young plants can grow in Turf & Surf for up to one month without adding fertilizers or nutrients

It works by disrupting the insects’ ability to breathe

Ready to use right out of the bag

Very affordable

28x32x1 MERV 13 AC Furnace Filters 6 Pack books-&-videos The high calcium content ofNordic Pure MERV 13 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, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200