@Chris1975
You need to run a lab water test.
This particular test includes:
pH, Turbidity, Color, Total Hardness, Chloride, Total Iron, Manganese, Nitrate, Sulfate, Total Dissolved Solids, Arsenic, Cadmium, Copper, Lead, Mercury, Selenium, Zinc, Cyanide, Fluoride, Non Carbonate Hardness, Standard Plate Count, Coliform Bacteria, E. coli
https://www.testtech.co.th/th