What do you measure it with? Next time I come over I'd like to bring my NO3 probe and we can try some measurements with it. Reason I say that is I find it's a bit startling how differently my probe reads a nitrate level than what my test kits read out at. For example, I get about 5ppm NO3 readings using both Elos and Salifert .. which suggested to me that maybe my NO3 was around 5ppm, but when I use the probe it tells a much different story (30ppm).
So I'm not disputing your 5ppm, it may well be that, but I'm just curious what readings I'd get on different water.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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