DC202-3-in-1 Filter 3 Stage Anti- Allergy, Charcoal & Deodorise Filter. Traps various dust, air borne particles and odour, and recirculates cleaner air back to the environment. Suitable for asthma, hayfever and allergy sufferers, effectively helps controls mould, condensation, bacteria growth, house mites and odour. Do not wash the 3 in 1 filter. Clean only with a vacuum cleaner. The filter should be replaced after 3 to 6 months, depending on usage and the environment. Only use 3 in 1 filter for air purification purpose and remove the 3 in 1 filter during the dehumidification.