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International standard density of air filtration, safe and more at ease. Without any chemical toxic substances, please use the rest assured. White filter cotton is recommended to replace 1-2 pieces in 1 month. Effectively filter PM2.5 fine particle dust in the air. It'll give the healthier and freshest air with each breath. Not only help you keep your lungs clean, but also prevent dust, dirt and other substances. This CPAP filter will enable your machine to be used effectively for many more years, and you can save money in the long term through preventative measures