Drains get blocked by ................ and .............

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Solution

Drains get blocked by cooking oils and fats.
Oils and fats should not be released in drains because they harden the soil in the sewage 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. 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.
Hence Drains get blocked by cooking oils and fats.

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