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趙挑姬 公州大學校 資源科學硏究所 1994 資源科學硏究論文集 Vol.2 No.-
5 Kinds of spring water saling at market prepared for testing of hardness and some other city water and cleaned water also and the rescult of the test for hardness were as follows 1. The Total hardness of all spring water was within about 50+20 ppm. 2. The order of total hardness was like the following ①water from mountain spring → ②Cleaned one of city water→ ③Spring water Ⅳ→ ④Spring waterⅡ → ⑤City water → ⑥Spring water Ⅴ→ ⑦Spring water Ⅲ→ ⑧Spring water 1 3. According to the reference (6) (p79) The content of the orgarnic minerals is not good for health of human body because it is the cause of several kinds of diseases and therefore the pare water is better for us to drink which doesn't contain the minerals but the total hardness of all the samples which I tested now was normal to drink.