Too much Mule Team?

[chem geek]

Blue to yellow in the TA test is normal when the FC is high. This is described in the Taylor interferences description here. It's still a valid test -- the colors will just be different. As an alternative, you can add more thiosulfate (R-0007) when you know the chlorine is high -- around 2 drops for every 10 ppm FC, maybe a little more.

[CarlD]

Blue to yellow in the TA test is normal when the FC is high. This is described in the Taylor interferences description here. It's still a valid test -- the colors will just be different. As an alternative, you can add more thiosulfate (R-0007) when you know the chlorine is high -- around 2 drops for every 10 ppm FC, maybe a little more.

Nice! Yes, when you run the T/A test you are supposed to start with 2 drops of R-0007--the chlorine neutralizer. But it's nice to know that if your FC is between 10 and 20, you need two more drops. Thanks, Richard!