I'm so glad you asked -- I get to use my shiny new photos of Hayward's sucky old chlorinator!

Here's what I think you have:


and, here's what may be your problem:


and another photo, in case you miss the point:


Unless your CL200 is on a bypass circuit, you are trying push the entire flow of your pool pump through a hole a quarter won't go through!

Hayward makes some great products . . . but this is not one of them! In my experience, the metering valve doesn't usually work, either.


Of course, it could be something else. Send pictures of your pump, filter and piping to poolforum AT gmail DOT com, and I'll take a look!