Review on Miele SF-HA 50 Active HEPA Filter: Ideal for S4000, S5000, S6000, S8000 Vacuums - 2 Inches by Claudia Davis

I once bought a different brand of HEPA filter for Miele (Filtrete) but found it didn't seal well and have only bought branded filters for since my 3 Miele vacuum cleaners. I change them once a year, although the newer ones have an odd timer that I haven't been able to figure out. What I do know is they fit in place and feel like they seal properly. I can't see/smell any particles coming out of the car's exhaust. 3-ply bags are probably all that's needed, but at $150 a year (3 vacuums) it's worth the reassurance.