03-07-2012, 12:30 AM
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If regent #2 of the nitrate API test is not shaken well it will result in a false low reading according to API Tech support (not high)....
Liquid Nitrate Test Kits from any manufacturer can have a common problem with their last test solution. For some companies, it is bottle number 3, but for us it is bottle number 2. One of the ingredients wants to solidify out of liquid solution. If the test bottle sits for any period of time, this can happen. If this does happen and the test is performed without Bottle # 2 mixed properly, then you can get a falsely low reading. I have never heard of falsely high readings with Nitrate Kits. I would try tapping your Bottle # 2 a few times on a table or counter top. This should loosen-up anything that has solidified. Then I would shake this bottle for about 2-3 minutes, to really mix it up. Try the test again and hopefully this will fix you problem. With regular weekly usage, this bottle should only need to be shaken for 30-60 seconds.
Although some feel that because nitrates are not as toxic as ammonia or nitrites, high nitrates are not a problem. In fact, high nitrates are not good for fish and can stunt growth, cause health problems and shorten life spans. In general, we should have tank nitrates < 20ppm, lower the better.
There are little/no nitrates in natural fresh water.
Last edited by AbbeysDad; 03-07-2012 at 12:34 AM..