to bring sand to the beach
01
無駄なことをする, 余計なことをする
to do something that is considered to be redundant or useless
idiom
例
The company's attempt to create a new product that was already available from many competitors was like bringing sand to the beach.
浄水器のある家にペットボトルの水を買うのは、無駄なことに思えた。



























