The cloudiness could be just dead algae not yet all filtered out. It be a good idea to run the pump all night. Check if the filter pressure has increased on your gauge. Backwash if need be. Turn off your SWG while shocking so you can getting a reading of the FC loss.

Why do I want my CC to be 0? The short answer is... if it's giving a reading more than zero, that would indicate there's some type of nasty stuff in your pool that needs to be killed.

Search for "combined chlorine" or "chloramines" if you're interested in the long answer.

Let us know how you make out.