Basically, the pumps will wear out in time. They can be easily replaced. The rest of the system, in polyethylene and PVC, the RGF Systems are built to last. I hear a lot about ozone. Ozone is heavy oxygen, which is an oxidizer like chlorine.
Ozone is a gas and is highly corrosive.
When made and used correctly, ozone can work to oxidize organics. However, many manufacturers use ozone units that are useless. Basically, they don't produce enough ozone, if any at all, to work. Some use ozone with steel or non-UV protected polymers, which will last about six months. Many use corona discharge systems without oxygen generators or air dryers.