What are chlorides?
Rule Your Pool - Un pódcast de Orenda Technologies, Eric Knight

Eric talks about the difference between the valence states of the chlorine atom. Cl+ is different from chlorides, which are Cl-. Chlorides are inert, but they can be recharged into chlorine gas with a salt chlorine generator, and they also interfere with stainless steel's chromium oxide layer, helping chlorine corrode it.