An eco-friendly active natural mineral water quality improver and a manufacturing method thereof are provided to improve water quality such as cloudiness by precipitating, dissolving, and decompose pollutants with natural minerals. An eco-friendly active natural mineral water quality improver includes clinoptilolite 60 ~ 80 weight%, rock-forming minerals 7 ~ 15 weight%, high CEC clay minerals 5 ~ 10 weight%, ash 5 ~ 10 weight%, and dolomite 2 ~ 6 weight%. The high CEC clay minerals is one or more selected from a group consisting of vermiculite, montmorillonite, and illite. THE high CEC clay minerals is the vermiculite, the illite or their mixture. The rock-forming minerals is one or more selected from a group consisting of rock-forming minerals muscovite and felspar.
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