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Re: Nitrate Test Problem

I am using a Red Sea  Nitrate test  kit that provides two test methods.  
Method #2 uses three liquid reagents and is described to be the more accurate 
test.  Method #1uses a powder and one liquid reagent.  the instructions state 
that if method #2 returns a value of less than 2.5 ppm, then confirm with 
method #1.

Problem:  With  method #2 I just determined 0  ppm.  Method #1 however 
returns greater than 20 ppm.  This is repeatable, even  after carefulrinsing 
of the test container in tap water followed by a rinse in the tank being 
tested.  Anyone else have a similar experience?  Suggestions?   The 
instructions state that the local water supply may contain contaminants that 
would invalidate test results.  They offer no recommended action if Test #1 
does not confirm Test #2 results.  I'd call the Red Sea customer service rep, 
but he is probably busy defending his family.