Alkalinity test in the T100

[kjdo]

Any thoughts about color change? Typically it is blue and then you add drops of #9 until it turns red (or in high chlorine it turns yellow). Any thoughts if it just turns a different color or blue? I wasn't sure if I "overshot" the red? Has anyone seen this before. I tested it yesterday and that didn't happen. Just a curiosity question.

 

[jblizzle]

You can find more detailed info about all the tests here:

extended-test-kit-directions-t25081.html#p206395

 

[chem geek]

It usually starts of green and goes to red after you've added enough R-0009 titrant. If it starts off blue then that usually indicates a high chlorine level in which case it will go to yellow. You can add more R-0007 thiosulfate drops to reduce the chlorine at the start of the test so that you have a normal green to red transition.