We see it ALL the time!
Use 20 Mule Team Borax (laundry aisle at Walmart) to raise the pH. Maybe a third of a box at a time. Retest, redose as needed. Don't add 10 lbs. of baking soda all at one time. A couple of lbs at a time, let it circulate a few hours, retest and redose gradually. Smaller doses are better than one big dose.
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