Apply once a week throughout the vegetative growth phase of the plant
keeping your rhizosphere at an optimal temperature
Optimal Conditions: 68-100°F with higher relative humidity as temperatures rise
and outdoor gardens of any type
preservative and dye free
25x29x1 MERV 13 AC Furnace Filters 6 Pack Grow Strong Apply once a week throughoutNordic 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