Respironics have two basic CPAP Machines filters. The white ones are the disposables more often changed and the dark ones are the pollen filters which can be washed a few times until they deteriorate. A bag of each should last about 6 - 12 months depending on the quality of the air the machine is being used in. Next you will need to make sure you are buying either the M Series (latest) type or filters for the previous version of CPAP machines RemStar NON M Series. If uncertain, please call for help.
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