Last Water and the Father’s Custom

Hello Rabbi.
My father has the custom of taking the last water before the blessing of food. The custom of taking the last water is, as you already know, because of the salt of Sodom, which the Torah says was found in certain places. What concern is there about the salt of Sodom today? Am I obligated to continue this regulation? It did not spread among the people of Israel, it was amended to certain places and it was also amended because of (this is one of the reasons, according to what I know) scientific information that was available at the time (they were afraid that it might touch their eyes and cause blindness).
Thank you!