We have been using these filters for a year and they have helped us a lot. Allergy sensations, blocked sinuses etc bothered everyone in the house. We have done drain cleaning and professional carpet cleaning. But when we upgraded to these air filters and upgraded to MERV 8, we immediately saw an improvement in air quality. They work great and I always have two on hand. When I put on the second filter, I order a new two-pack.
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