I have an above ground pool with a gold line SWG. I would try resetting the unit. You can do this by turning off the power to the unit. I got a low salt reading one time after 6 inch plus rain and had to add salt and reset. You should be just the opposite! To bring down the salt level you will have to drain and refill and reset the unit.
I always check my salt with a salt test kit before doing anything.
Joe
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