I kept getting a low salt reading on my swg, i added so much salt that it had to be partially drained. test strip reads 3600 and swg reads 1500 with board indicaters light( check salt, check /cell) I have cleaned the cell in acid and see no signs of buildup. I have replaced the flow switch because that was the first indicater needed. This is an quarite system. Please give me some needed input of what i should do? Must I buy a new cell, this one is four years old.