ONA Breeze Fan Professional Hydroponic Grow Room Odour Control Neutraliser fogger The Rhino Hobby provides flexibility The Rhino Hobby provides flexibility and a longer shelf life due to its unique FULLY REVERSIBLE NECK and the fact that it's filled with the highest quality carbon available This form is available immediately as it 100% bioavailable from the start Supplying eco friendly odour solutions to commercial industry since 1995 ONA products are used in extreme locations such as sewage and rendering treatment plants Peeling back the seal and allowing the fragrance to passively penetrate the environment will take care of nuisance smells for most small grow rooms