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Despite everyone's best intentions, concrete structures sometimes crack.  If those cracks occur in the shell of a pool, spa or other watershape and are big enough, they'll eventually leak - which often leads to development of even bigger cracks and far larger headaches for everyone involved. In many cases, nobody is to blame.  You might have worked under the guidance of a geologist or engineer and used good construction practices in building a structure meant to withstand the tests of soils that expand, contract, shift, settle and occasionally quake, but structural cracks are a fact of life.  You can