Your FC, pH and CYA are all fine. With a CYA of 50, you need to keep the chlorine between 3-6 all the time, although if it is a little higher than 6 like it is right now, that is fine. But, you don't want it to go below 3ppm or you risk an algae bloom. Test your chlorine level every evening and add enough bleach to get back to around 6ppm. Reread post #14 above for more about this. Test your pH a couple times a week and make sure it stays between 7.2-7.8. Test your alk (TA) a couple times a month. You want it to be between 80-125. Test CYA in a month. It shouldn't have changed much if any.

Only use bleach for your chlorine. No trichlor pucks, not dichlor shock.

It might be helpful to you to watch some online testing demos from Taylor Technologies. They can be found here:

http://www.taylortechnologies.com/pr..._slideshow.asp

Hope this helps. Enjoy your pool!