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English definition of “filter bed”

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filter bed

noun [C] uk   us  
an area of stones and sand through which water flows to be cleaned
Translations of “filter bed”
in Chinese (Traditional) 濾床,濾層…
in Chinese (Simplified) 滤床,滤层…
(Definition of filter bed from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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