The frequency with which you change your filters depends on several factors including the cleanliness of the air in your environment. Typically, ultra fine filters are replaced every few weeks. You can use the filter itself to help determine when it needs to be replaced. The simple rule is that once it appears to be significantly discolored, you should replace it.
Keep in mind that while these ultra fine filters are disposable, the gray foam filter is 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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