After 2-3 weeks of use this washable filter is still white and clean compared to my regular Merv as per the attached photos too see is 8 3M filters that show so much dust and cobwebs. To confirm the efficiency of the airflow I did a test with a hair dryer, the air has a hard time getting through due to the limited airflow so it makes constant noise when starting up in my attic HVAC due to the inefficient airflow. I bought 4 of these and trusted the reviews as they were 10% off. Very disappointed that I had to send it back. I want it to work so I don't have to buy traditional filters and save the environment. So do your homework before you buy more. Learn the lesson. Should have bought beforehand. Fortunately, purchases are still possible within 30 days.
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