When the CL test gets yellower with time, this usally means high combined chlorine. That with the green water may mean that you have an algae bloom.
Use this chart to determine what amount of chlorine you may need to shock the pool:

http://www.poolforum.com/pf2/showthread.php?t=365

Also, can you post all of your readings PH, CYA, Alkalinity, hardness?