I accept that simple is a relative term depending on the person judging how simple it is.
Irrespective of this the Murphys solution to water treatment is very simple.
Send water off.
Get results back.
Buy what Murphys tell you to buy on the phone.
Look at results sheet.
Work out how much of either white powder or clear liquid you need to add and crack on.
Studying water board results, undertaking titrations yourself, using spreadsheets and procuring/adding reagents etc etc etc is simply not simple

I would add that my degree and background is in biomedical sciences and analytical chemistry.
I use the Murphys report and their reagents because my life is too damn busy to be faffing around doing it any other way other than the "simple" way

And no, I am not on commission and do not work for or have any connection to Murphys other than being a satisfied customer.