I've searched some threads and it seems like the general consensus on TFP is that ozone systems are unnecessary, don't decrease the chlorine needed, and the system may consume chlorine somehow. I'm having a pool installed and the builder convinced me to include and ozone system with the pool and it is included in our contract. I've had several discussions with him about it, but he swears by it, has it on his pool, says you need it for kids to have lower chlorine, etc. I've asked him to take it out of the and give me a credit for it, but he says its free, he's throwing it in, and there is no credit to take it out of our contract. It's not a huge $ item to start WWIII over, but if I'm not going to get a credit, should I just have him install it, or would you just tell him to keep it?