Corrosive water causes etching of plaster pitting of concrete and dissolving of grouting. Plastic liners wrinkle and crack. Pump and filter equipment corrode, rust and eventually freeze up or leak or both.
This is caused by improper water balance.  

Test all water factors and balance water before it is too late.  See Problem: Water Balance/Saturation Index.

Perfect Pool and Spa Software! Users: Test water and input all results into the main screen. Follow recommendations.

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