The Caso Design Replacement Water Filter for Hot Water Dispensers Pack of 3 is for replacing your old filter to ensure optimum filtration and purification. A new filter will make sure that the water is the best quality it can be with an improved taste by reducing the amount of pollutants found in tap water and preventing the growth of bacteria. As well as this, swapping out filters when the time comes can improve the longevity of your device by preventing the build up of harmfull bacteria and limescale. Dimensions: 6 x 11.5 x 6 cm. 3 filters included.