The ONA block is ideal for small areas such as closets, foyers, attics, cars, gym bags, boats, kitchens, garbage cans, cupboards, vents, or... near a grow box!

Simply remove the cap or punch several holes in the cap and place in desired location. The ONA block measures 3" x 3" and will fit in most places.

The ONA block will release its powerful odor neutralizing agent and keep the location free from undesirable odors. Replace as necessary