Yes. A pH of 8.3 is too high. Get some muriatic acid and add some very slowly in front of a return jet while the pump is running. Wear glasses, gloves, stay upwind of fumes, pour close to the water surface to avoid any splashing. It is nasty stuff. Start with about a cup. After a couple of hours, retest and redose as needed until you get the pH between 7.2-7.8.
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