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How Water Filters Remove Contaminants Without Chemicals
净水器如何不使用化学品去除污染物
精读先不看文字，完整听一遍。
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Most household filters combine activated carbon, ceramic pores, and sometimes ion-exchange resins.多数家用滤水器结合了活性炭、陶瓷微孔，有时还加入离子交换树脂。
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Activated carbon traps chlorine, pesticides, and volatile organic compounds through adsorption—not chemical reaction.活性炭通过吸附（而非化学反应）截留氯、农药和挥发性有机物。
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Ceramic filters block bacteria and sediment with microscopic pores smaller than most pathogens.陶瓷滤芯利用比多数病原体更小的微孔阻隔细菌和泥沙。
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Reverse osmosis systems force water through semi-permeable membranes, removing dissolved salts and heavy metals.反渗透系统迫使水流经半透膜，去除溶解盐和重金属。
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Filter lifespan depends on water hardness and contaminant levels—hard water clogs carbon faster.滤芯寿命取决于水质硬度和污染物浓度——硬水会更快堵塞活性炭。
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Certified units list tested removal rates for lead, cysts, or fluoride, helping consumers compare performance objectively.经认证的净水器会标明对铅、隐孢子虫或氟化物等物质的去除率，便于消费者客观比较性能。
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Regular cartridge replacement ensures effectiveness; expired filters may leach trapped contaminants back into water.定期更换滤芯才能保证效果；过期滤芯可能将已截留的污染物重新释放到水中。
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Unlike boiling or chlorination, physical filtration preserves minerals unless specifically designed to remove them.与煮沸或加氯不同，物理过滤通常保留矿物质，除非专门设计为去除矿物质。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Most household filters combine activated carbon, ceramic pores, and sometimes ion-exchange resins. 多数家用滤水器结合了活性炭、陶瓷微孔，有时还加入离子交换树脂。
- Activated carbon traps chlorine, pesticides, and volatile organic compounds through adsorption—not chemical reaction. 活性炭通过吸附（而非化学反应）截留氯、农药和挥发性有机物。
- Ceramic filters block bacteria and sediment with microscopic pores smaller than most pathogens. 陶瓷滤芯利用比多数病原体更小的微孔阻隔细菌和泥沙。
④ 懂 · 选一选
⑤ 今天会说这一句
Most household filters combine activated carbon, ceramic pores, and sometimes ion-exchange resins.
⑥ 跟读并录音
Most household filters combine activated carbon, ceramic pores, and sometimes ion-exchange resins.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Most household filters combine activated carbon, ceramic pores, and sometimes ion-exchange resins.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。