Quote Originally Posted by szampino
...........snip....................
CYA - 50
TC - 5.1
FC - 4.2
CC - .9
PH - 7
Those chloramines indicate that you have an unfulfilled chlorine demand. You are at a good pH for chlorine so that's good news!

You need to follow Carl's post stickied at the top and start dousing your pool with Chlorine until your chlorine level remains the same overnight and your CC's have returned to 0.

Test 3 times a day as he says and keep dumping in bleach to keep your Chlorine at shock level according to Ben's best guess chart. Just keep up the bleach and the testing. Everytime you drop below the shock level you allow the critters to reproduce and get another toe hold taking longer to clear the issue. So first get that chlorine appetite fed. Then when your chlorine is holding overnight any secondary issues can be solved.
hth,
Jo