i can understand but we are also using chlorine in French Alps where water is fine . 99% of the time .( evian badoit ….) Purpose of 0,2mg chlorine is to protect , just in case . And no chance to do that with UV

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i can understand but we are also using chlorine in French Alps where water is fine . 99% of the time .( evian badoit ….) Purpose of 0,2mg chlorine is to protect , just in case . And no chance to do that with UV