As for the filter properties, they work well. The problem with my item was that it was packaged in a sealed plastic bag but eventually got wet. They were dry, but about half of the filters were warped and not flat, which meant I had to wet them, place them between something very flat, and let them dry completely to flatten them out again. I needed them so didn't have time to send them back for a replacement. Don't know if anyone else has had this problem.
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