Your premium mineral water is nearly mythic, a Classical elixir – with its high TDS and beautiful and wild BC origin.
Introducing HYLAS. To paraphrase the Greek myth, Hylas was kidnapped by the nymph of the spring of Pegae, and though Heracles searched, he was never found. Hylas had fallen in love with the nymphs and remained "to share their power and their love." (from http://en.wikipedia.org/wiki/Hylas)
Even if one's not familiar with the myth, HY communicates the high TDS. And 'Hylas' – Latin in origin – is well-suited for an international audience.