In general, it's very difficult to reliably remove 100% of the broken glass from a filled pool. The rougher and more pitted the pool surface, the more likely it becomes you'll leave some glass behind . . . and that it will get embedded at someone's foot.

Of course, you don't have the legal risk in a home pool that you do in the country club pool I drained -- provided only family swims in the pool. But a $200 + 4 hours doctor or E-room visit, to probe for and remove a small glass shard is still something to consider.

If you have a pool that can be safely drained, and if your water costs are not too terribly high . . . I'd recommend doing what I did -- draining to expose the shallow end, removing all the glass you can, and then washing anything that's left into the deep end with a hose and nozzle.

With a fiberglass pool, IF the surface is in good condition, I'd do like Watermom suggested, and then carefully and repeatedly brush into the deep end.

With inground vinyl, it's tough call. Draining is hard; getting all the glass out may be hard.

What sort of pool do you have?