The Disposable Fine Filter for DreamStation CPAP Machines (6 Pack) is a six pack of filters for use with the DreamStation machines from Philips Respironics. The disposable filter is housed in the lighter blue frame and blocks fine particles. This filter can be used in conjunction with the reusable filter in the darker blue frame.This is a six pack of fine filters with frames only and does not include any other products or parts. The disposable filter should be replaced every 30 days or earlier if it shows sign of damage or appears dirty. This is a disposable filter that must be replaced regularly and cannot be washed.