@Hienohelma It's true that Cl² is very poisonous to almost all lifeforms, but I think you need it to be concentrated enough for that. And I'm pretty sure that with only the amount you get from a bikini you are on the safe side. It's already diluted enough in pool water for it to be harmless anyway (well I suppose if you were to boil the entire pool, that would cause problems, but if it's just the amount contained in a bikini that gets vaporized...)
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@Hienohelma It's true that Cl² is very poisonous to almost all lifeforms, but I think you need it to be concentrated enough for that. And I'm pretty sure that with only the amount you get from a bikini you are on the safe side. It's already diluted enough in pool water for it to be harmless anyway (well I suppose if you were to boil the entire pool, that would cause problems, but if it's just the amount contained in a bikini that gets vaporized...)