I just tested a friends pool and don't know what I should work on 1st. He uses HTH Dual action pucks (Trichloro-s-Triazinetrione with copper) for chlorine. I have the Taylor K2006 test kit.
PH 5 or so (I had to test with my aquarium kit to verify this low)
TA 0 (best I can tell because the green drops turn pink instantly)
I have been running my pool on the BBB for 2 years and never had anything crazy like this and I double checked my numbers. Thought the TC may have been too high to measure but diluted with distilled water all the way to 5 to 1 and nothing. Did the same with TA.
Any suggestions would be appreciated.