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schmutzdecke

schmutzdecke n. a naturally occurring gelatinous layer of living biological matter on a sand-based water filter, for which it provides additional filtration. Editorial Note: Occasionally spelled in English as “schmutzedecke” or “smutzdecke.” Etymological Note: German schmutz ‘dirt’ + decke ‘covering.’ (source: Double-Tongued Dictionary)

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Further reading

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