Suggestion? It is advisable to replace your CPAP filters every 2 weeks or as needed. 100% Satisfaction Warranty? Free change or 100% money-back if you meet any problem or missing parts. please do not hesitate to contact us, we will try our best to help you to ensure your 100% satisfaction. Important Statement? This CPAP filters is not original product, it is compatible with Philips Respironics CPAP machines. Universal Replacement Filters for Dreamstation CPAP/BiPAP Machine. Product is provided by Longevity Turtle Technology Co., Ltd., No relationships with Philips Respironics.

100% QC Tested? All products have been 100% factory automation QC tested. Absolutely TOP quality and reliable. Ensure Clean Air ? Each filter is designed to block more fine particles and large particulate matter, so as to protect you and your machine and provide the cleanest air to maintain the health of your lungs and Improves quality of your sleep. Protection? Changing CPAP filters regularly ensures clean air which is essential for your equipment to remain in solid working order for many years. Dust Filtering? With the exact fit and great filtration efficiency, you can rest assure you’re filtering the air coming in exactly as intended. Package Contain? This filter kits includes 4 reusable pollen filters and 12 disposable ultra-fine filters.