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You may be able to handle the little cracks in your concrete or fiberglass pool, but you should leave the big stuff to the pros. For any cracks in either kind of pool that are wider than 1/8 inch or longer than 1 foot it will pay to hire a pool care professional. You can find a qualified pool care professional through your local chamber of commerce, Better Business Bureau or court records. Of course, if you come across any contractor with a lot of past court cases against it, just keep looking.