Protect your investment: Search for b07rszsync or Core300-RF to get a real Levoit replacement filter to ensure that the product you buy is worth your investment Core300 replacement filter: Designed for Levoit Core300 air purifier to maintain its optimal performance. At a cost-effective price, you need to save a lot of costs for your air cleaning throughout the year. It is recommended to replace the filter every 6-8 months Real high-efficiency air filters imported from Japan: H13-level real high-efficiency air filters that meet high-efficiency particulate air standards are used. It can filter particles in the air, such as pet dander, dust mites and pollen, effectively helping to improve allergies Capture large particles: Ultra-fine nylon pre-filter captures large particles such as dust, lint, fiber, hair and pet fur, which also helps to maximize the life of the filter