![](https://nthumb.tpgimages.com/mid2_ocom_img/c2NpZW5jZV9waG90bw==/20101126_rm_2/2010112619/top_20101126193829_3711.jpg/TOP06672055.jpg)
Water purity test. Samples of water being tested for their pH levels. All the samples seen here are alkaline (having a pH greater than 7). This indicates that the samples are of hard water. Hard water contains dissolved minerals of calcium and magnesium. The minerals are harmless, but can cause problems with plumbing.
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Creative#:
TOP06672055
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達志影像
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RM
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須由TPG 完整授權
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