13x20x1 Exact MERV 8 AC Furnace Filters 12 Pack additives Add 2-5 mL of Grow

Add 2-5 mL of Grow B per gallon of water during the vegetative growth phase

Innovative 6" circular vents maximize reflectivity

Designed to drive either halide or sodium bulbs properly with separate wire leads

This high UV A spectrum adds the nutrient values that are vital for the growth

Used at regular intervals throughout the flowering stage

13x20x1 Exact MERV 8 AC Furnace Filters 12 Pack additives Add 2-5 mL of GrowNordic Pure MERV 8 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 8 furnace filters are comparable to HVAC filters with the rating of MPR 800. While different companies use different scales to measure the air filters