Active Carbon Filter For the AOS Air Purifier & AOS Combi Humidifier/Air Purifier Price: £23.49 incVAT Service life - 6 months. The interval recommended for the replacement of the active carbon filter is a standard figure. If in doubt follow your nose - a stuarated filter has an unpleasant smell. Note the date of the replacement of the filter. A lable is provided on the handle of the filter element for this purpose. FREE UK DELIVERY

Features & Benefits:  Replace this filter every six months