a calcium additive
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Plants thrive when roots are allowed to breathe
per gallon of water with each watering
25x32x1 MERV 13 AC Furnace Filters 6 Pack spl_jondon a calcium additiveNordic 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