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Backgrounds (1) Taste & Odor issue (2-MIB & Geosmin) ·A source of customer complaints ·They are regulated at 10ng/L in the standard for drinking water quality in Japan ·Maximum concentration in source waters 1) 1) Asami.M.(2005) 1400ng/L (geosmin)→ Lake Biwa (The largest lake in Japan) 697ng/L (geosmin),164ng/L (2-MIB) → Lake Kasumigaura (The second largest lake in Japan) ·Conventional processes can not remove them.