|Re: Discrepancy in Nitrate Tests|
Subject: Re: Discrepancy in Nitrate Tests
by Squish on 18/1/2010 10:40:04
Just to add, the nitrate test is more likely to give a false low than a false high reading, suggesting it's the new one giving the duff result. If the reagent bottle that needs shook has been sitting on a shelf for a long time then it will need shook really hard, and possibly gently knocked off a hard surface to get the 'ingredients' back into solution as they will start to solidify when it is just sitting there. If you're using it regularly than shaking it for about 30 seconds will do but for a new bought test I would try shaking it for a lot longer, probably more like 2 or 3 minutes.
I got this information from a thread on another forum here: http://www.fishlore.com/fishforum/tes ... aster-test-kit-users.html as I was having problems with 0 nitrate results when my tank first cycled months ago.
It also says that the numbers on an API kit are the date of manufacture and each one has a shelf life from that date. Don't know if they've changed that now? But it's all in that thread if you have a read of it.