Cristian mineral water, Mineral spring in Lázně Libverda, Czech Republic.

Kristiánův pramen (Christiansbrunn) is a mineral spring in Lázně Libverda, drawn from a fissure in the granite massif of the Jizera Mountains at a depth of 109.80 m. The water emerges at 11.4 °C with a pH of 5.42 and a redox potential of 303 mV. Since 1811 the spring has been covered by a rectangular structure joined to the spa colonnade, given its final form in 1912–1914.

The spring was captured in 1793 and named after Kristián Filip Clam-Gallas, owner of the estate and founder of the spa. From 1811 a rectangular structure covered it, given its final form between 1912 and 1914; it adjoins the spa colonnade and is protected as a cultural monument. In the 1880s the water was shipped to Prague and sold as "Libverdská kyselka"; bottling ended in 1952.

The spring is named after Kristián Filip Clam-Gallas, owner of the estate and founder of the spa. Its German name is Christiansbrunn. The water, sold in the 19th century as "Libverdská kyselka", is still used for spa cures in Lázně Libverda.

The spring is housed in a rectangular structure from 1811, rebuilt in its final form between 1912 and 1914, which connects directly to the spa colonnade in Lázně Libverda. The water is drawn from a depth of 109.80 metres and comes out at 11.4 °C, so it is cool to the touch. The building and colonnade are protected as a cultural monument of the Czech Republic.

Bottled as "Libverdská kyselka", the water was shipped to Prague from a warehouse in Jezuitská Street in the 1880s. Under tenant Franz Leupert, output rose tenfold in seven years, and 200,000 bottles left in 1910. Sales ended in 1952, when newer sources left iron deposits in the bottles.