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    Pool chemistry help

    I have a 12,500 gallon pool and these are my readings: TC-0 FC-0 pH- 7.6 ALK- 90 CYA- 40 Sailt- 3400 Phosphates- 100 Nitrates- 0 Pool location- Texas The water is crystal clear but I can't get a chlorine reading. I just installed a new salt system (CompuPool 20k) 6 weeks ago. Please help.