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@Mr_Sworld
The GF app has a beta water correction system in it.
If you email your local water supplier and ask for a water report they will send you a couple of pages of details.
You'll only need a few results from it (just certain mineral concentrations) .
The problem is getting the CaCO3 reading as they sometimes give hardness in a different format.
Have a look on the Brewer's Friend website, they may have a report on there for your supplier / area.
Then it's just adding chemicals to the mash and sparge water.