I think I have both Elos and Salifert for nitrate but it's been some time since I used them. Unless it's a really low reading I usually have a really hard time with colour comparisons and there's a lot of guesswork involved. It's like you say, I end up just using them to spot trends rather than establish an actual number.
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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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