I knew the trichlor was a no-no, it does have about 5% copper such and such. I really only got it in order to add CYA while I was waiting on the dichlor to arrive so I don't really use it.

After the additions of dichlor and stuff last night I finally got my first CYA reading this morning.

This morning I am at:

FC: 16.0 (down from 18.5)
pH: 7.5
CYA: 60 (oops--in my desire to finally show some it looks like I overshot the target a little)

From the 'best-guess' chart I guess I will hold my chlorine at 20 for another day or two until I quit losing more than 1ppm. My only fear is that since I now have CYA at a decent level and I don't get much sunlight that I won't be able to get my chlorine down within about a week...