I have a Hayward swimpure that is probably 4-5 years old. The past couple weeks the salt indicator has been falling, which made no sense so I had it tested and it is 3100 ppm. Display says 2100 ppm. Low salt and check cell lights are lit, and generating light is dark. Pool chlorine level tests near zero.
I cleaned salt cell with acid wash and took it to be tested. It passed. But I still have the low salt and check cell lights lit. What's going on? The guy at the pool shop (Leslies) is trying to tell me the swimpure control box is bad, but I don't believe him.
Other info. The whole system is controlled by a Pentair suntouch. Pool is 27k gal