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I'm sure it was ascorbic acid. The real question is, can a pool be regrouted? Is it a costly job? What kind of grout should be used. My neighboors both have pools built by the same company but with different workers. They have the same water supply and do not have a problem.

I did an acid cleaning a year ago. The problem has now returned.

Is it possible to regrout a pool? I'm sure the wrong grout was used during construction. Is it costly? The iron in the water has turned the grout brown. :(