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At present society ,the water pollution has become increasingly serious and water we drink almost be filtered. Whether this kind of water is not harmful to our health? However,the magic cup can show us that water we drink is acidic or alkaline. The color of the cup will have different reactions when it`s taking in acidic water or alkaline water. People can easily keep a healthy drinking through these changes of the magic cup.People can easily keep a healthy drinking through these changes of the magic cup.