According to Ayurveda, water stored in a copper vessel has the ability to balance all the three doshas in your body, (vata, kapha and pitta) and it does so by positively charging the water. Storing water in a copper vessel works as a purification process. And this copper Lota (a round metal pot) also use for worship purpose of God in Home, Office, Temple or every holy places. This Jug (lota) usually use in Indian villegers so this is based on healthy villegers experience.