Product Description CPAP Filters, For Philips Respironics Dreamstation CPAP Machine Filter Kits The reusable filter can be washed every two weeks to maintain a clean and healthy CPAP machine. Universal ReplacementCompatible with Philips Respironics DreamSation CPAP machine. Filter Replacement ScheduleTo obtain optimal results remember to replace the reusable Ultra Fine filter every 90 days and the Ultra Fine filter every 30 days. Size: 4 Standard and 4 Ultra-fine for respironics dreamstation filters,52 Disposable Ultra-Fine Filters Statement: This cpap air filters is not original product, it is compatiable with Philips Respironics Dreamstation CPAP machines. Universal Replacement Filters for Philips DreamStation Cpap BiPap Machine. Remember : Remember to replace your disposable Ultra Fine filter at least once every 30 days and pollen filters at least once every 90 days for optimal use. sooner if they appear dirty. Instructions: To install an ultra-fine filter in your DreamStation, slide the blue foam pollen filter out of the cpap machine, securely snap the light blue ultra fine filter onto the base of the foam pollen filter, and insert them both back into the device. cpap filter for dreamstation