Why is it advised not to throw cooking oil,paint or grease into the kitchen drain?

It is not advised to throw paint or oil or fat in the kitchen drain because paint and contain some kind of chemical which blocks the drain and oil hardens the soil in the pipe and fats get clogged up to the openings of the pipes .
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Because it can block the drain
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It blocks the drain and hardens the pipe
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we should not throw oil or grease because the fats in the grease and oil from your kitchen mix with the other chemicals in the sewers and form nasty conglomerations of chemicals that can build up and block the pipes that take our dirty water to the wastewater treatment plant.
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we should not throw oil or grease because the fats in the grease and oil from your kitchen mix with the other chemicals in the sewers and form nasty conglomerations of chemicals that can build up and block the pipes that take our dirty water to the wastewater treatment plant.
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Why is it advised not to throw oil in the water
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