I think they will create pressure but having chlorine rip apart your cell membrane seems different enough from disrupting pathways (or something else like an an

I think they will create pressure but having chlorine rip apart your cell membrane seems different enough from disrupting pathways (or something else like an antibiotic does) that it seems as though it would be considerably harder to evolve against. There are things like microbial cysts that are already protective in these cases but the tradeoffs for the organize are pretty large to adopt something like that. https://en.wikipedia.org/wiki/Microbial_cyst https://en.wikipedia.org/wiki/Microbial_cyst