I have an Aqua-Rite SWG, the replacement T-15 cell is aprox 4 years. The problem I'm having this year is the Salt reading is way off. It keeps dropping to 1900 to 2200 and stops generating. 2 different pool stores have told me 3200 and 3100. I've re-calibrated it several times and after several hours it always ends up back at the too low reading and it stops generating. I've checked the Voltage and Amps and they all falling within specs, current reading is 24.6 Volts and 4.10 Amps. I've cleaned the cell to no avail. Is this Cell already dead/dying or is there anything else I can try before buying a new one? 4 years seems like an awfully short lifespan for these.