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Old 06-23-2016, 07:06 PM   #1
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Api nitrate test kit

Has anyone else had issues with api nitrate test kits going bad. I've been fighting what I thought was high nitrates. Always had high levels really red finally carried some water to lfs and test was just a little off yellow. Went ahead and purchased some new bottles to test again when I got home. I had two sets of older bottle at home. Here is a picture of all three test making sure I went by manufacturers institutions perfectly. Left to right are new to old bottles. Click image for larger version

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Old 06-23-2016, 07:42 PM   #2
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I have heard of this (eg if bottle cap is left off in hot weather or they simply no longer read true).

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Old 06-23-2016, 08:02 PM   #3
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That and they simply expire over a period of time and need replaced.

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api, ate, nitrate, test, test kit

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