Saltwater pools have a distinct baseline. Considering the fact that salt chlorine generators need somewhere while in the community of 3000 to 3500 ppm of salt, the freshwater advisable limit of TDS goes out the window. On this Wikipedia the language one-way links are at the top in the page https://erickyhpyf.bloggazzo.com/18963547/the-2-minute-rule-for-best-fluoride-water-filter-pitcher