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How obtain pH of 6.5-7.5, by measurement simply or by adjustment additionally.

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qazqaz1982(½ð±Ò+1,VIP+0): 9-9 12:57
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qdstar2008

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qazqaz1982(½ð±Ò+1,VIP+0): 9-9 12:57
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qazqaz1982(½ð±Ò+1,VIP+0): 9-9 12:57
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