The sulfuric waters used in Busko-Zdrój are a special type of groundwater that is used for therapeutic purposes. The therapeutic sulfur-hydrogen water is sourced from the "Zuzanna" spring in the Winiarska Forest. It is crystal clear with a straw-greenish hue and a distinctive odor. The hydrogen sulfide content is 45 mg/l, and the iodine content is 2.2 mg/l. From the moment the water is sourced until it is prepared for bathing, its physical and chemical composition remains unchanged.

The National Institute of Public Health – National Institute of Hygiene has issued a certificate confirming the therapeutic properties of sulfuric water.

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Sulfuric waters are used for full baths, half baths, or partial baths, as well as for drinking treatments under the strict supervision of a doctor. Sulfur baths have significant therapeutic applications. They exhibit anti-inflammatory, regenerative, detoxifying, and keratoplastic effects.