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V. Replacing the Dust-cup
1. When the dust reach to the 1/4 level in the dust-cup, it means
dust-cup is full. At this moment, dust-cup should be emptied or the
filter should be washed.
2. Open the dust-cup as showing in the picture.
*Attention: Don't wash the filter in the washing machine or dry it with
electrical heater, please re-fix it after drying the filter in the air.