There are some slow-dissolving Cal-Hypo pucks, but they tend to fall apart near the end and leave residue and they increase Calcium Hardness (CH). Unfortunately, there is no slow-dissolving source of chlorine that doesn't add CYA nor CH. The Trichlor pucks aren't literally separate CYA and chlorine put together -- they are a compound molecule that in water forms separate CYA and chlorine.

You do have choices for automatic injection or production of chlorine without adding CYA or CH. You can add a saltwater chlorine generator (SWG) to produce chlorine from salt water or you can get The Liquidator that is discussed in this thread and adds bleach or chlorinating liquid or you can install a peristaltic pump as discussed in this thread (and other threads).

Richard