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that's an ioniser, not a chlorinator. by itself they don't provide adequate sanitation as they don't kill certain things fast enough. i don't think they are approved for use without chlorine either. personally i'd only use one if someone in your household has really bad reaction to chlorine and...

they are all chlorine. the only two approved sanitisers are chlorine and baquacil. the difference between salt water pool and "chlorine" pool is that the chlorine is made on the spot via electrolysis of salt water.