I think this is the third incident, counting the one Ben had to deal with, that we've heard of this year on the forum of broken glass in a pool.

The only other suggestion I have is that after you have removed all you can see is to shine a flashlight into the water at night to make it easier to see any pieces you might have missed. I'm not sure that it will work, but I think it would.

Good luck. What a pain to deal with.