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ELI5 Salt Sanitation for a swimming pool

How does salt sanitize the water of a swimming pool?
gpt
Chlorine generator in the pump lines creates chlorine via electrolysis. A very small concentration of salt is required to make the process more efficient. 

People choose salt water pools for the “feel” but also to get around the negatives associated with adding liquid chlorine every day or from using powdered or puck chlorine. 

Chlorine is broken down by UV rays, so manufacturers add conditioners to the powdered or puck chlorine (cyanuric acid) which acts as a “sun screen” for the chlorine. Unfortunately, the acid builds up over time and reduces ability of the chlorine to do its job. Only way to remove this acid is to replace water, which is not ideal. 

Salt water pool negatives include damage to surrounding metal fixtures and/or certain types of rock, grout or tile used in the pool.