: why does saltwater systems in pools kills bacteria and algae, while the sea is full of life?
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Because salt water pool systems convert the chlorine ion in salt (a sodium ion with a chlorine ion [NaCl]) into actual chlorine through electrolysis. The chlorine generated kills off bacteria and algae much like a regular pool. This system eliminates the need to dump chlorine into the pool as it is generated from the added salt.
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