I pulled three of these ant-like creatures from my pool just now. They have very wasp/mantis shaped heads and have huge thoraxes. Their antenna do not have the distinctive elbow you see with ants, so I'm guessing these are a type of wasp? All three are very differently sized as well.
These are pictures of the biggest one which is about 6 - 7 mm long. Some of these pictures are decent, and some are awful. I'll include them all.
Sorry I couldn't take better pictures. I'm getting ready to head out of town and I am kind of in a rush.