Actually, baking soda will not raise both. Baking soda raises alk. 20 Mule Team Borax (laundry aisle at Walmart) raises pH. And, yes, it is fine to add Borax and baking soda one right after the other with no problem. Just add them slowly to the skimmer while the pump is running, breaking up any clumps.

Do yourself a favor and order a Taylor K2006 or 2006C through the test kit link in my signature below. It will make your pool maintenance much easier.

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