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Thank you, see that's information i need. I'll try to find a way to keep it at 70 or below. Yes I have a ppm meter too. I have a combo meter, Hanna HI 98129. Not that I've ever used the ppm meter in it though so if someone could tell me it's purpose and how to use it id appreciate it. Pretty much all I know about it is ppm=parts per million but parts of what am I measuring and what is optimal? :-)
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