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There are two filters in each pack.These filters are washable.Each time the dirt cup is emptied, the filter should be cleaned (Filter will be discolored after use. This will not affect the filter's performance.)It's very important that you let this filter completely air dry before reinstalling it into the vacuum cleaner.Do not operate cleaner without filter and do not operate cleaner with a wet or damp filter. Failure to do so can cause the motor to fail if any moisture enters it.WARNING: Always dry filter for 24 hours before replacing. Do not use detergent or hot water to clean filter.To extend the service life,we suggest you don't wash the hepa filter in the first 3 months.You can beat the hepa filter to remove the dust on it.