Pre-filters can be washed! Use a screwdriver to loosen the screws holding the pre-filter in place. Use water to rinse it or a soft brush to gently clean it. Remember to dry it completely before putting it back into the purifier.
As for HEPA filters, we conducted tests using 4 used HEPA filters and found that washing the filters reduces its effectiveness. According to the data, we should never wash our HEPA filters. You can check out the data here: https://smartairfilters.com/en/blog/wash-clean-hepa/
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