Response to Chlorine is a good choice for swimming pools. It costs less than bromine does and is stabilized unlike bromine. Chlorine is pH dependent and a fluctuating pH will affect how well the chlorine works. Chlorine also works better at lower water temperatures. Bromine is not stabilized, meaning the sun will burn it off quicker than chlorine. Bromine isn't as dependent on the pH levels and will still be effective at higher temperature levels.

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