Question

why should oil and fats do not be released in drain explain.​

Answer 1

Oils and fats harden and block the sewage pipes . In an open drain also fats block the porosity of soil which effects its water filtering efficiency.That is why oils and fats should not be released in the drain.

Answer 2

Oils and fats should not be released in drains because they harden the soil in the pipes and block them. Fats get clogged in holes of the soil in the drain and block it. It does not allow the water to flow.