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Old 01-10-2011, 11:36 AM   #1
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Yet Another API test Q

I've begun to question the validity of my Nitrate test bottles. No matter how long I shake the bottles, I continously get high Nitrate readings in my tanks. I've done tests on my tap water and those also get high nitrate readings. That might suggest that my tap water has high nitrates, BUT my 37 gal is a highly planted tank. It would be reasonable to expect that tank to have lower nitrates but according to the API test bottles, it does indeed have high nitrates. Now, I know the Nitrate test is notorious for having issues do to user failure, but I'm just not convinced that is what is happening because when I take a water sample to my LFS or use test strips, my nitrates in that tank are always <10ppm. Thoughts? Do they even sell a Nitrate test that I could buy and test against mine? I've seen the ammonia test bottles but not any of the other tests packaged singly.
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Old 01-10-2011, 01:22 PM   #2
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how high are your nitrates?
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Old 01-10-2011, 01:46 PM   #3
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Usually 40ppm. That's a big discrepancy from 10ppm. Also, if I compare my test strips against the liquid tests for Nitrites and Ammonia, they always match.
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Old 01-10-2011, 02:02 PM   #4
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API sells all their test kits individually. It's just a pain to find them locally.
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Old 01-10-2011, 02:24 PM   #5
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Good to know, thanks. If that is the case, then I'm thinking maybe I should search online for the Nitrate test to see if I get one to compare to the one I have!
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