Computer · Environmental Engineering
In a slow sand filter, the layer formed by a reddish-brown sticky deposit of partly decomposed organic matter together with iron, manganese, aluminium, and silica is called:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Base material
- 2Autotrophic zone
- 3Heterotrophic zone
- 4Schmutzdecke✓
Correct answer
Schmutzdecke
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