The Invacare Polaris uses 2 different filters: A disposable and reusable filter, together. Use the following link to purchase the Reusable Black Foam Filters.
Return On Warranty Issues Only
Specifications
Product Specifications
Length 5"
End width 1"
Center width 2"
Contains 6 filters.
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Important Tips
Filter for older model Invacare Polaris cpap.
Tips for inserting filters:
1. If you are using the disposable white filters, insert it into the filter area first, mesh-side facing in, towards the device.
2. Insert the gray foam filter into the filter area, on top of the fine filter.
"Haven't used this product with my filter before, but it seems to be working well. Not sure how you judge its efficacy until I change the filter and see how much gunk it trapped."