17x20x1 MERV 10 Plus Carbon AC Furnace Filters 12 Pack Ventilation You need to add nutrients

You need to add nutrients when you first water the substrate (use your nutrient supplier's recommendations)

No additional ingredients are required

The complete life cycle lasts roughly 30 days

and works well in hydroponics

clean Golden Yellow product made from pure worm castings and the most potent seabird and bat guanos

17x20x1 MERV 10 Plus Carbon AC Furnace Filters 12 Pack Ventilation You need to add nutrientsNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.