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Changed from Mahle Caremetix to Hengst Blue.care: https://www.hengst.com/en/hengst-ne...t-bluecare-ensures-the-best-air-quality/ Hengst frame has seal and the construction/design is better, more pleats. Old Mahle (1 year / 10k) had no dust on the blue side, so worked quite ok anyway though...