regarding the staining you mention,
I think your referring to the 'no-scaling' category in the add.
they do mention calclium which is whats used as a stabilizer in Cal-Hypo. That can definitenly cause scaling and staining if pool chemistry gets out of control.
CYA stabilizer - I havent heard of any occurences where it caused staining, except by putting granular CYA directly in the pool and not using a sock or some other container to keep the acid off the pool surface.
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