Quote:
Originally Posted by Nicmar
There is no expiry date on the bottles, I threw the cardboard away when I first got it. The problem I see is the first colour change is at 5.0ppm so anything under that just reads 0. Do you know if you can double the drops to test inbetween 0 and 5? Or is unrealistic to get these values in a reef tank.
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there should be a 'code' printed towards the top of each bottle. the last 4 numbers the month and year they were bottled. the tests are good for 3 or 4 years depending on the test. i don't think you can test for 0-5 nitrates with the api kit. anything under 5 should be just fine. what does yours read?