if the unit is reading a much lower salt level then a reliable test then the cell might need cleaning or it might be going bad. Cells are rated in hours of use and several factors can shorthen their life such as running the cell with low salt levels which makes it work harder to produce chlorine, running the cell in cold weather, high calcium in your water leading to severe scaling in the cell, 'shocking' the pool with the superchlorinate setting on a regular basis.
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