A, ona, block Polar Crystal odour control, ona, block comes conveniently packaged in small tubs for use wherever odours, occur. Simply remove the cap, or punch several small holes in the cap, and place in desired location. The ona block measures 3 ³ x 3 ³ and will, fit in most places. Ona, block will release its powerful odour neutralizing agent and keep the, location free from undesirable odours. Ona block does not mask smells, or cover them up with a more pungent smell; it removes them by, dissolving the offending particles. The, ona block is ideal for using in areas such as near to grow rooms and, grow tents. And in houses, attics, cars, gym bags, boats, kitchens, refuge bins, cupboards or vents. Ona block will eliminate smells from, pets, plants, rubbish, mould and mildew smoke and germs. Ona block is totally organic, its blend of 32 essential plant oils, allow the complete removal of the malodorous molecules. Available, in three popular scents: fresh linen polar crystal and professional.