Q.

What is the percentage of purification of septic tank effluent?

A. 30%
B. 50%
C. 70%
D. 90%
Answer» C. 70%
Explanation: the effluent that flows out of this, which is about 70% purified, is then put into a soak pit. a soak pit is a cylindrical tank with porous brick walls surrounded by a layer of gravel.
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