You need to test. That is the only way to know what is correct..
Baking soda is only if your T/A is too low.
For pH you will either need to add acid (pH too high)or Borax (pH too low).
You will also need to add some stabilizer. How much depends on how much you want.
That is the only way your questions can be answered. I wish I could tell you "Add 3 gallons of bleach, one box of Borax and you'll be fine". But I can't.
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