The basis for treatment at the spa of Czerniawa-Zdrój was provided by Spring Jan, a hydrogen carbonate-calcium-magnesium-ferruginous mineral curative water, evidence having been found that drinking the mineral water of the spring lowered blood sugar level. Drinking therapy was aimed at eliminating heavy metal content from the body, for which reason children from industrial areas were once treated in Czerniawa. Water can be tasted at the spa house of Czerniawa-Zdrój Traditional Remedy Centre.
