Activated carbon is designed to remove any organic molecules which cause odour – Cheese, fish, garlic, raw meats. Essentially smells are derived by flowing air picking up these different ‘molecules’. Fridges circulate a lot of air internally in order to keep cool, a necessity for them to function but also the ideal environment for a wide combination of organic molecules to be picked up and mashed together, potentially creating unsavoury odours. DeoTech blocks are also specially designed to be moisture and water resistant, meaning they will not break down or degrade within your fridge – Effectively ensuring six months of continued, reliable use! The best location for your DeoTech block is the upper shelf of your fridge. Within a refrigerator you have a small fan which circulates the air, essentially pushing cold air into the top, and drawing it out through the bottom . As cold air sinks and hot air rises, this flow gives the most ‘even’ distribution of heat within the overall fridge compartment. Sitting your DeoTech block on the top shelf means it will be near a constant source of air-flow. As long as the block is placed in the correct area then the performance will be noticeable within an hour or two of installation. Suitable for all Fridges.