1.[2Pcs Replacement Filter:]The composite filter set include 2 pcs air purifier filters for replacement, it can be applied to our air purifier. When you need to replace the filter element inside the air purifier. you only need to buy a set of filter element assembly for long time use, The size of the air filter element is 4' 4' 1'. 2.[3 Layer Composite Filters :]The composite filter include meticulous pre-filter, true HEPA filter and activated carbon filter ,It can remove odors effectively, such as pet, smoking and cooking odors around your living spaces and filter particles larger than or equal to 0.3 micron and air pollution of PM 2.5 to help improve overall . It's perfect for children, pet owners and patients. 3.[Better Using Experience:]Our cotton filter is suitable for essential oil using. You can add your favorite essential oil to the filter to have both clean air and a fragrant smell. The soothing aroma will give you a sense of relaxation and help you sleep well during the night. You'll have both an aromatherapy machine and an air purifier at the same time. 4.[Easy to Replace: ]The replacement of filter is convenient and time saving. You just need to rotate and remove the old filter element and put in the one. Easy to install and no tools required. Frequency of filter replacement will depend on the environment quality conditions of your house .The filter element needs to be replaced every six months in general to ensure that the air purifier can effectively clean the air and protect your .