Microbial Communities of Low Temperature, Saline Groundwater Used for Therapeutical Purposes in North Poland

Knowledge on microbial community composition and ecology in highly mineralized (TDS up to 71 g l⁻¹), cold waters (T Desulfovibrio) in the deepest waters. The most important geochemical drivers of the observed microbial community composition were TDS including Cl⁻, Na⁺, Mg²⁺, and NO₃⁻. Bacterial isolates belonged mostly to the genus <i>Bacillus</i>. Sequences assigned to Archaea (<i>Methanobacterium</i>) were detected only in the deepest borehole water.