bring sand to the beach

bring sand to the beach

To do or undertake something redundant, pointless, or futile, usually in the context of bringing something to a location where it is abundant or unnecessary. The company always caters lunch for these meetings, so I don't know why you bring in your own sandwich. You might as well bring sand to the beach!
See also: beach, bring, sand
References in periodicals archive ?
She says it will cost an estimated 70,000 euros to bring sand to the beach, money which Peyia municipality doesn't have.