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Old 06-05-2012, 05:23 PM   #1
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Help! 4 different nitrate results!

I have a 75 gal tank that has been cycled for about 2 weeks but has no livestock except for a few hermits and snails
But I went to test the nitrates today and I have 3 different test kits these are the results and te brands of the test kits:
1999 Aquarium Pharmaceuticals inc. 10 ppm
2006 API saltwater master test kit. 20 ppm
2008 API freshwater master test kit. 0 ppm
Retested again with the API freshwater and got 10-20 ppm
All taken from the same side of the tank, i would like to know which one can be trusted most and which ones if any I should throw away
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Old 06-05-2012, 05:33 PM   #2
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The youngest one is 4 years old. I would toss them all and buy a new kit. They arent that expensive.
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Old 06-05-2012, 05:34 PM   #3
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Are the kits that old? From 1999, 2006 and 2008? If so, they are all trash.
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Old 06-05-2012, 06:29 PM   #4
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You have to shake a bejesus out of the nitrate tests to get good results. And not just a couple of good shakes, but rather a minute or so of fairly violent shaking.
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Old 06-06-2012, 10:26 PM   #5
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I believe those are just copyright dates for the brand and not the actual manufacture date.
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Old 06-06-2012, 10:49 PM   #6
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Quote:
Originally Posted by bigben2057
I believe those are just copyright dates for the brand and not the actual manufacture date.
I would be sure of that. If they are that old. You will never get an accurate reading. Save yourself some trouble and pick up a salifert nitrate kit for bout 20 bucks. Great test kit.
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Old 06-06-2012, 11:59 PM   #7
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Thanks everyone for the inputs, but I think I'm going to take a water sample to my lfs and take a water sample for me at the same time and see which one matches with theirs and see IF any are still good
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Old 06-07-2012, 12:53 AM   #8
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If their is a small c in a circle next to the date you are looking at that the copyright date my brand new nitrate test has the copyright date of 2006 on it to also aquarium pharm...
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Old 06-07-2012, 08:32 AM   #9
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I'd do what Schism told you and get a salifert test kit don't rely on the api the salifert is way more acurate
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Old 06-07-2012, 10:28 AM   #10
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From API customer service:

Each reagent bottle has a Lot # printed on the bottle. The last four digits are the month and year of manufacture. Example: Lot # 28A0102. This is a pH reagent manufactured in January of 2002.

Pond Care Wide Range pH, ammonia, High Range pH, Nitrate, phosphate, Copper, calcium and GH all last for three years. nitrite and KH will last for four years. Freshwater pH(low range) and Pond Care Salt Level will last for five years.

Liquid Nitrate Test Kits from any manufacturer can have a common problem with their last test solution. 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 your problem. With regular weekly usage, this bottle should only need to be shaken for 30-60 seconds.

Always check results at the recommended duration of time. Letting the tubes sit longer can result in falsely high levels."

Hope this helps!
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