Therme București

Therme București, opened in 2016 in Balotești just north of the capital, sits above a significant geothermal reservoir in the Ilfov region — the same basin exploited by Therme's sister facility in Budapest — where underground temperatures reportedly range roughly 58-84°C. According to the operator's own technical FAQ, the geothermal water is extracted from more than 3,100 meters deep and then processed (decalcified, desulfated, deoxygenated and ozonated) before reaching the pools, which are maintained at bathing-comfortable temperatures around 33°C; as required by Romanian pool-safety regulation, the water is also chlorinated once in the pools. The mineral load — magnesium, iron, calcium, manganese and silicon — comes from the deep thermal reservoir itself rather than being artificially added, distinguishing the complex from a purely chlorinated recreational water park even though its scale and slides give it the feel of one.