Hi, currently I have the Hayward inline chlorinator CL200 and it is about 3 years old. Right now, the O ring in the cap needs to be replaced. I talked to a couple of the local pool stores about buying an O ring replacement. They mentioned the Pentair Rainbow 320 is a better chlorinator than the Hayward from a maintenance perspective. Does anyone have any experience with the Pentair 320? Is it easy to install? All thoughts are welcome. Thanks in advance.