hairline cracks in skimmers

Jul 14, 2010
22
Reno, Nevada
I was just doing a mid-winter check of my skimmers and discovered several hairline cracks in them - very disappointing as they were just installed summer before last as part of a major remodel. I've always been careful to put a Gizmo in each skimmer when I winterize, and this winter they were nearly dry when I checked them because we have had very little precipitation. So what happened, and what should I do about it?
 
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