Oils and fats should not be released into the drain.
This statement is true.
Oils and fats should not be released into the drain. In an open drain, the fats clog the soil pores reducing its effectiveness in filtering water. Also, they may kill microbes that help to purify water. Therefore, oil and fats should always be discharged after taking due care, either in the dustbin or if possible, in some suitable dumping place.