how fast does your CYA rise to 100 levels ? Have you been using the frog system for a while ? How often do you go through those chlorine packs ?

You can switch to bleach/liquid chlorine or use a combination of both. After you drain to lower CYA you may want to use a low setting on your frog to dispense trichlor as a steady supplement and use bleach for the rest.

I like the idea of having the feeder there to keep some chlorine going because at times I forget to add chlorine and that is a good way to get algae. The sun in socal really seems to use up chlorine fast so if you are not dilligent with adding bleach you could run into problems.