What kind of kit are you using? Borax is used to raise pH and baking soda is used to raise alk. I do not know of a pH test that can differentiate a reading that low. If you are below 7.0, you need to continue to add Borax. Readings below 7.0 are acidic and can damage your pool. What is the volume of the pool?
Actually, go ahead and fill in your pool's information in our pool chart as this makes it easier for us to give you good advice.
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