I had the same problem that you did, the water just didn't "sparkle". I went to the pool store and grabbed a 25lb bag of glitter. They told me to mix it in a bucket of water and throw it in while doing a handstand. Now the water sparkles too much so I am going to order some glitter remover in hopes to reduce the sparkle ( <---- just kidding of course).

Seriously though you may have very small particles suspended. The suggestion of the skimmer sock and running the filter for a few days is good and worth a shot.

Good luck.