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This is a biologically time-release formula
Perfectly sized for standard germination trays
Industrial 4 hp blower for maximum efficiency
which results in optimum growing conditions for your plants
11_1/2x21x1 Exact MERV 13 AC Furnace Filters 6 Pack grow-light-ballasts This is a biologically time-releaseNordic 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
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