Question

why should oil and fats be not released in the drain?

Answer 1

Answer- Oil and fats be not released in the drain because they can clog up the drains as a result, water won't be able to pass through them.
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Answer 2

That is why it is harmful to discharge untreated sewage into rivers or seas. ... Answer:Oils and fats harden and block the sewage pipes. In an open drain also, fats block porosity of soil which affects its water filtering efficiency. That is why oils and fats should not be released in the drain.