K.F.
Hi- We don't have a pool but did have a pool party for a huge number of young children at our local tennis club. We hired two teenagers who were junior lifegaurds to "watch" the pool and kids. It worked perfectly, parents with really young kids went in with them but the older swimmers had trained eyes on them while adults relaxed a little and talked. These girls took their job VERY seriously. The lifegaurd program they go through is awesome and it really teaches the kids how important their job is, they do not take it lightly! Also I would put a life jacket on my little ones at the pool before they were good swimmers, a little peace of mind goes a long way in a party situation. I wouldn't count on the fence alone as you may not have much fun stressing over who may get in the pool zone. Have fun!