EricH,

I don't understand how your CYA isn't going up when using Trichlor. What's the size of your pool and do you have a sand filter that you backwash and if so, how frequently? Do you have lots of rain that spill over the pool to dilute it?

Do you have your own Taylor K-2006 test kit to test for CYA or are you using a pool store for the measurements?

Richard