Fish make the best pets. Surveys taken in elementary schools all over suggest that more than 85% of students have had fish as pets. Fish have been around longer than dinosaurs--over 400 million years! There are more types of fish than there are mammals, birds, and reptiles combined. People have enjoyed watching fish for a very long time.
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Following are the useful ways of utilising wastewater:-
(a) Wastewater can be used to recharge the groundwater
(b)Wastewater can be used for irrigation
(c) treated municipal water can be used for washing cars, watering the gardens
(c) certain pollutants in sewage water can become fertiliser for various crops.
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What's ur question in it or it is just extra information paragraph.. anyways have a good day
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