e/Schmutzdecke

Information
has gloss	eng: Schmutzdecke (German, “dirt cover”, sometimes wrongly spelt schmutzedecke) is a complex biological layer formed on the surface of a slow sand filter. The schmutzdecke is the layer that provides the effective purification in potable water treatment, the underlying sand providing the support medium for this biological treatment layer.
lexicalization	eng: schmutzdecke
instance of	c/German words and phrases