Our low cost housebrand HEPA with Activated Charcoal filter remove tiny particles and also remove odor from the air. Air filter should be changed once it is dirty, usually 1~3 months depends on your usage environment.

Note: This filter can only fit our Highstar Air Purifier sold here: http://list.qoo10.sg/g/459508395. We provide customization for other sizes used in other air purifiers, please contact us (bulk order above 50pcs only).