15x15x1 Exact MERV 7 AC Furnace Filters 6 Pack propagation trays 1 Phase) are built to

1 Phase) are built to last

This can provide more opportunity for nutrient availability and may increase fruit and flower production

Sachets will be active for about 4-6 weeks depending on infestation level and predator establishment

If you live somewhere with cold

15x15x1 Exact MERV 7 AC Furnace Filters 6 Pack propagation trays 1 Phase) are built toNordic Pure MERV 7 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 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters