Waste Water Engineering
The clarigesters are

Circular Imhoff double tanks with bottom hoppers
Circular septic tanks
Circular Imhoff double storey tanks without bottom hoppers
Rectangular septic tanks

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Waste Water Engineering
In case of sewer lines

Test for straightness is carried out with the help of a lamp and mirror
Water test is carried out to check water tightness of the joints
Obstruction test is carried out with the help of smooth ball of diameter 13 mm
All listed here

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