Thanks guys for the great info.

I break down and clean the filter every fall at closing, so I'm familiar with the process.....and yes, it's a PIA.

I think I'll try the test chem geek suggested to see if the filter is placing much demand on CL levels before I resort to taking it apart.

The info about what happens to CL when breaking down ammonia is interesting. Through this whole process CC never got above .5ppm which makes me wonder if I had that much ammonia to deal with.