Salt Water Pools are not Chemical Free
The salt water sytem injects caustic soda (Sodium Hydroxide) and chlorine gas into the water. This chlorine and Sodium Hydroxide solution is sent to the pool via the plumbing and in the pool it will convert back to salt. But all the time the pool must maintain a chlorine reading. A salt water pool is not chlorine or chemical free, you still use alkalinity up, pH up, pH down, cyanuric acid and other chemicals. All a salt water system does is move the chemical factory from NJ to your backyard.