Keep in mind that high phosphate level in your pool water can kill chlorine. Most pool stores do not normally check for phosphate unless you request the test. Four years ago, when my cell tested okay and the chlorine level was zero, the phosphate level tested very high. Once I lowered the phosphate level in the pool, (it took four days) the chlorinator was able to maintain a normal dhlorine level. The pool store suggested the high phosphate level was because i live near a golf coarse that uses phosphate from time to time to fertilize their greens.
When a cell is near the end of it's life expectancy, it typically displays a lower chorline level on the screen then the actual chorline level in the pool. The chorenator is designed to turn the cell off when the salt level in high. I was told by the manufactuer it frequently it does not. Adding more salt to an already high salt level in the pool water may damage the chlorinator electronics. Replacing the control boards is expensive.
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