I have already washed and reused the filter and am replacing it after the paper filter starts to deteriorate. The first two times I washed this filter by rinsing it lightly under the tap in the sink. Last time I soaked it for a few minutes to remove fine dust. It was a bad idea. The next time I used it, the creases collapsed. Anyway, I could still use it multiple times, so it's better than 1 time. Big.
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