I believe that ozone systems are unneccessary in outdoor pools.
You will be alot happier with your pool if you learn how to take care of it yourself. Read all you can at poolsolutions.com as well as the stickied threads in the pertinent forums here (you'll have to log out to see the rest of this site).
The single most important tool you can buy is a Taylor K-2006 test kit. The reason pool stores test your water for free is then you are almost obligated to take their advice - usually "Buy this overpriced chemical, dump alot in, come back and buy some more."
Good luck, welcome.