These gray foam filters are reusable. That means you can wash the gray foam filter, let it dry completely, and then reuse it. You can repeat this process with the gray foam filter until it begins to deteriorate. Foam filters can easily last several months.
The foam filter is considered to be required, while the white ultra fine filter is generally considered to be optional. CPAP-Supply.com recommends using both the foam and ultra fine filters together because they help to keep your flow generator - and more importantly your lungs - in tip-top shape.
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