You know what it looks like… but what is it called?
TAKE THE QUIZImhoff tank
noun
Im·hoff tank
ˈimˌhȯf-,
-hōf-
: a tank for sewage clarification consisting of an upper or sedimentation chamber with sloping floor leading to slots through which the solids settle to the lower sludge-digestion chamber
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Merriam-Webster unabridged
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