Is there such a saying? Futile may be either because it will fail or because it is unnecessary / already taken care of. I considered:
too many chefs spoil the broth


It's like carrying coals to newcastle

But neither are very good... A formal sounding colloquilism is also ok.

marked as duplicate by Jim, FumbleFingers, Mari-Lou A, choster, Hellion Jan 27 '14 at 23:07

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You could use

beating a dead horse


carrying water to sea

But why not just use "pointless?"


WOMAT (waste of money and time) may do to express that.

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