I have the Taylor K2006 kit. I tested the CYA undiluted first and then when I saw it was over 100 tested it diluted 50/50 and it was about 90.
I shocked the hell out of it with the HTH Super Select 56% sodium hypochlorite, two bags yesterday and one today and will test the chlorine tomorrow. I use bleach normally but keep the HTH around for heavy rains, etc.The water looks clear but hubby said he saw algae . My PH jumped up since last week to 8.2, which is unusual because it has been pretty steady for several weeks, so I added some muriatic acid today.
When I had the high CYA problem years ago, I remember all too well that the pool store kept telling me everything was good. Thank goodness I found this forum and got it all straightened out!
I will be more careful with the Trichlor from now on!