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1. 办法就是一到两个月就将过滤网清洗一次。

   bàn​fǎ jiù​shì yī dào liǎng​ge yuè jiù jiāng guò​lǜ wǎng qīng​xǐ yī​cì.

   The solution is to clean the filter once in a month or two.

   Source: CCMatrix