For security if you have a place where you can stick a web cam I would get some software where it records to the hard drive any movement in the pool aera. If the oil slicker attacks again you will have proof and you could seek reinbursement for damages. I have set up a cam and cought the kids next door sneeking in the pool when we are not home. I had a talk to them and their parential units while showing them the video. The video stoped any denial of their actions.
Steve