Kneipp Herbal Bath Salts are sourced from ancient thermal spring sea water and infused with high concentrations of plant essential oils for their beneficial effect. Directions for use: Gradually add up to two capfuls to running water and stir (the crystals dissolve quickly). The water should be hot or very warm. Immerse yourself for 15 to 20 minutes. It's like a natural "shot of adrenaline" for your skin. Follow with a cold shower. Emerge--feeling renewed in body and mind. Consult the herb descriptions before selecting your Kneipp Bath.