Well in the case of a floating liquid dispenser the chlorine would be fully shaded inside the container and used up within a week. I really don't think sun light degredation would be the roadblock here. As for heat it's cooler in the pool than in my storage shed. The hardware store that I buy chlorine from keeps the jugs on a pallet out in the sun - not ideal but they go through them fast enough and the chlorine I've picked up form them always works. I've kept yellow plastic 2.5 gallon jugs that I plan on using soon next to the house (week or two) in partial South Florida intense sunshine just like the pool is exposed to without appreciable degredation. Not ideal but it didn't seem to be too much of an issue.
The desolving CYA as binder I can understand, though other slow desolving binders could certainly be used I'd thnk.
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