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 Breathing filter to prevent the transfer of dust particles, bacteria & viruses as small as 0.02 microns. This filter allows normal passage of air while breathing into the AltoLab unit. However, the internal filter surface should not get wet, as water droplets will block normal air flow. When this happens, let the filter dry before using again.
Some people use a hot hair drier to dry out filters if they should get wet.
For proper hygiene it is best not to share breathing filters with others.
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