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thank you all very much for your comments. at the time when I was typing this thread i the api nitrate was still 0 but minutes later when I came back I wasent 0 anymore. it was more like 10-20 ppm. so bottom line is I spoke to soon and I do have nitrates in my system that I need to look into why. but yes I do agree I need 3rd opinion on this, since I don't know what is my actual number
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