The water purifier is not used for a long time. What should you pay attention to when restarting? Ask me!

The water purifier is not used for a long time. What should you pay attention to when restarting? Ask me!
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Can the black silica to be used in the water purification ?

Can the black silica to be used in the water purification ?
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Those historical water pollution incidents

Those historical water pollution incidents
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