This facie indicates modern groundwater and originated as a result of the dissolution and ion exchange process, almost refers to fresh and/or slightly brackish water.
Dr. Bayan Hussein's suggestion is accurate. It may be either fresh or mild brackish water. The mechanism of ion exchange or dissolution that he has stated is spot on.
I have similer type of water type in my study area and the detail report is available in my publication linked below. Go through the link it moght help.
Article Geochemical and geostatistical appraisal of fluoride contami...