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Twist the locking knob with a anti-clockwise, to take off the filter.
Clean it carefully.
Dry it by airing.
Warning:
when the filters are obviously with dust or the suction decreases considerably,
please clean it promptly, which can improve the working efficiency and extend the life of
the vacuum cleaner.
Never use the appliance without filter.
Put back the filter and twist the locking knob with a clockwise.