K&N reusable air filters
I took the plunge and bought two, infinitely reusable K&N home air filters. The cost was something like $130 but we'll worth it, IMo. They should pay for themselves in about 3 years. They're very heavy and seem well-made. No cardboard here.
The filter efficiency rating is 11, which is at the high end of the residential range. It's almost hospital-grade. The picture shows a comparison of the new K&N against the crappy Tru-Blu I was using before. It's pretty obvious which one will filter better.
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