I always get the little package open and ready to add to the testing sample bottle for C-2 test before I start the test procedure, you have max 3 mins. to dissolve the powder for C-2 test and make sure you have a dry soft rag on hand to polish off all the finger prints on the test bottle before you put it in the checker for both C-1 & C-2 testing.
Hope this helps.
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Hey! I never "LEFT" the hobby, just doing fresh water now. Which is still listed as part of Canreef if I'm not mistaken. 
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