I got real curious about the Br/Cl incompatibility and did some research. Apparently, the main problem is that Chlorine is more reactive than Bromine and will replace the Br in the salts (primarily NaBr and CaBr) in a "brominated" pool.
I think I understand what I read but maybe not since it seems to me that NaCl and CaCl ionize in water and it shouldn't make much difference which salt is present.
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