How do I clean Filter Style 1?
Turn the upper filter assembly ¼ turn counterclockwise and lift out, then gently pull apart to separate the upper filter assembly. Rinse the filter under running water until most soils are removed, using a soft brush if necessary for hard-to-remove soils or calcium deposits. Then reinstall the filter.
From the official Whirlpool Dishwasher Filter Assembly manual, page 2
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