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i use 5 mic filters to filter moss and fish (guppies) out of drinking water at home ,these last about a week before noticable flow loss 17 litres per min to 2litres per min. these filters will still allow bio agents through.
i'm guessing air filters will have about the same performance?
at work i use a dust / gas respirator, paper particle filter and charcoal filter this is rated at 20 mic. it will still allow flu germs in.
in heavy dust i have to replace front particle filter every 4-5 hours.
hope this helps.
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