In your pool, each gallon (4 quarts) of 6% bleach will add 3.6ppm of chlorine. Use that as a reference to help you figure out doses of bleach to add. With a CYA of 90, you need to be keeping your chlorine between 5-10 all the time or risk an algae bloom. And, when you do need to shock, your shock level will be 20ppm. Test the chlorine (and pH) each evening. At that time, add enough bleach to get the chlorine back up to 10ppm. With a CYA as high as yours is, you may find that you can add bleach every 2 or 3 days instead of daily without the cl dropping below 5ppm. You'll soon learn how your pool behaves through testing with your kit and through observation of your water.

By the way -- you might want to try those chlorine tests again. You don't have a FC and a CC reading of 111. This testing demo may be helpful to you:

http://www.taylortechnologies.com/Ch...P?ContentID=11
http://www.taylortechnologies.com/pr..._slideshow.asp