Hi,
when I test for CA using this kit when it gets close to the blue end point the liquid turns purple. Adding another drop or two will then transition it to blue. Once it turns blue, if I swirl/ mix it a bit more and wait another 15-20- seconds it will go back to purple. I'll add another drop and it goes to blue and, swirl a bit more and it will stay longer then the first time but it will go back to purple after abut 30 seconds. Usually the third drop does the trick and it stays blue and does not go back to purple.
My question is which of the three blue transitions is the one I should base my reading on? Historically I base my reading on the final transition to blue where it holds but I was at my local fish shop recently and they thought it was the first. The difference between the first and last is about 20-30 PPM so was wondering what the experts on R2R think!
thanks!
beachsidereefer
when I test for CA using this kit when it gets close to the blue end point the liquid turns purple. Adding another drop or two will then transition it to blue. Once it turns blue, if I swirl/ mix it a bit more and wait another 15-20- seconds it will go back to purple. I'll add another drop and it goes to blue and, swirl a bit more and it will stay longer then the first time but it will go back to purple after abut 30 seconds. Usually the third drop does the trick and it stays blue and does not go back to purple.
My question is which of the three blue transitions is the one I should base my reading on? Historically I base my reading on the final transition to blue where it holds but I was at my local fish shop recently and they thought it was the first. The difference between the first and last is about 20-30 PPM so was wondering what the experts on R2R think!
thanks!
beachsidereefer