Hi Ullstad You can ...

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Hi Ullstad

You can calculate the SI (solubility index) to give you an idea of the precipitation potential. As you can see the pH has a huge impact on the precipitation potential. Without lowering the pH you will always have a problem. Just check the following source for more info:

 

https://www.drink-water-eng-sci.net/6/115/2013/dwes-6-115-2013.pdf