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Grey stone that contains white crystal core. On the surface, there is a dense array of tiny holes that can absorb detrimental substances such as excrement, residual food, ammonia, nitrite, hydrogen sulfide, and heavy metals. In addition, medical stone stabilizes the water pH level and helps soften the water. It is rich in many kinds of metal oxides, which emit oxygen and trace elements. Medical stone is a great filter material for keeping the water clean.

Note: Always rinse before use!