ONA gel Tropics is an industrial strength odour neutraliser that is safe and environmentally friendly to use around people, pets and plants. Originally developed to mask odours in fire damaged properties Ona is now the bench mark for horticulture odour control. It contains essential oil based technology which consumes odour molecules. Other products mask odours, but Ona gel destroys virtually all of odours naturally. Applications include: smoking rooms, kitchens, bathrooms, rubbish bins, indoor gardens, workshops, offices, warehouses, aeration vents and just about anywhere odours are present. To use, simply remove the lid and place the container in an area with good airflow.