this post was submitted on 21 Jun 2023
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Do It Yourself
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If you find charcoal "pellets" in bulk, you can try and refill the casing.
I once tried carcoal for aquarium water filters, but it was too fine for the casings. The result was a black dusty mess.
But you can usually find no-name filters if you search for the fan model number and manufacturer.
@ebikefolder I found activated coal pellets for air purification use on amazon.