Filters work fine but one of them was clearly damaged and passed quality control. It broke in the plastic shrink wrap. Edit: 7/24/2021 I bought them again to give them another chance. I am changing my rating to five stars. The packaging has changed since my last review. The filters are now packed in plastic in a small box. None of the filters I received this time were broken. For the price they are great and work great. It is now unlikely that you will receive a defective item.