: why does saltwater systems in pools kills bacteria and algae, while the sea is full of life?
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Salt water pool uses electrolysis to create chlorine that disinfects a pool just like any other pool you add chlorine to. The reaction is 2Clˉ(aq) + 2H2O(l) → Cl2(g) + H2(g) + 2OHˉ(aq). Chlorine gas is produced which dissolves in the water and is what creates hypochlorous acid which has the bleach like anti microbial action. Also produced is hydrogen gas which you see bubble out of the water, and OH- ion which is why the pH keeps going up in salt water pool and you need to add periodic acid to keep ph in mid to high 7. range.
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