ONA Blocks are perfect for small, enclosed areas prone to developing less than pleasant odours. ONA has been destroying odours effectively for many years and is used in hydroponics and commercial applications worldwide. ONA is not only an excellent air freshener, it's a true odour neutralizer - effectively destroying bad smells.
Ona blocks are often used inside an Ona Odour control duct fitting the unit is fitted between two sections of ducting, an internal wire-mesh tube (accessed using and air tight lid) is filled with opened Ona Block, as exhausted air passes over these blocks any unwanted smells are neutralised.
Note - Available in two distinctive scents