Testing TA gives different colors than before

[etreaster]

I was trying to test TA today (Taylot K2006) and it should turn green then red...mine turned blue then yellow. It worked a few days ago when TA was 100. I used left overs from last years testing solutions and this years and both gave same results every time. Not sure what to make of it.

Todays other results (BTW I am fighting a yellow stain that I am trying to superchlorinate w/ a CYA 90-100)

pH 7.2
FC >30 (takes too much reagent to find true FC, last was 50)
TA ?
CH: 450
CYA 90-100

 

[jblizzle]

It is because your FC is high I think:
extended-test-kit-directions-t25081.html#p206395

 

[JasonLion]

jblizzle is correct. High FC levels bleach out one of the two colors used in the test. However, the other indicator still works correctly and your results are still valid, just with different colors.

 

[etreaster]

Thanks...makes sense. TA only 100