08-21-2012, 09:41 PM
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Originally Posted by allaboutfish
do i need to shake it if i do say 9 tests in an hour? i know id need to shake the test tube.
LOL! 9 tests in an HOUR? You're worse than I am!
Honestly, I would. The chemicals in that particular reagent have a hard time staying in solution, from what API told me when I contacted them about it. It is actually recommended that you give it a good TWO-minute shake down, along with a bang on the counter-top or two if you haven't used it for a week or so, if you really ARE testing 9x in an hour then the 30 seconds is probably okay ;)
Consider this. . . not only are the results for that particular test incorrect if the chemicals are not properly mixed before adding to the water, but you're actually running the risk of ruining the entire bottle if you use it without the chemicals suitably mixed. . . it sucks, I know, but I'd go ahead and err on the side of caution (and a sore arm) on this one.
And for goodness sakes! There is NO reason that you should need to test 9 times in an hour!!! You'll get tennis elbow, give it a bit of a rest