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Given that the reusable ones need to have their filters changed regularly, I think you'd probably be better off with disposable. That said, in terms of reusing disposables, I saw some info that suggests you can get at least 100 hours of use out of a disposable one before performance significantly degrades. In fact one scientist I saw suggested that the straps would break before a disposable gets clogged, even in a high particulate environment.
These are the ones we get on with. Slightly too small for my face, slightly too big for Jana but we both still get a pretty good seal so if your face is in the middle of ours, you should be golden!
https://www.amazon.co.uk/OptiPro-Particulate-Respirator-KN95-FFP2/dp/B086LJTJ2V
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I've been using disposable FFP2 masks for months. You can use them a lot more than the official usage life as @Stonehedge says but you have to bin them eventually.
I tried lots of pharmacies at the time, no joy, so ordered from Amazon. Honestly at the moment if you go around multiple shops trying to find them with a standard face covering which offers zero protection from contracting the virus you're probably undermining a lot of the benefit of FFP2/3 masks with those interactions! I would be avoiding shops where possible pre-Christmas.
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@hoefla
Ok thanks all, going to look for some non-valved FFP2 or N95. Leyland only seem to have non-rated ones now. Screwfix have lots of valved ones but only P1 unvalved. Time to hit the pharmacies I guess. Any recs for reusable ones?