I am having difficulty with Saltmaster Nh 4000 S chlorinator / cell. Pool tends to keep going green although my ph,free chlorine, alkalinity and stabiliser levers are ok. I Cannot get the chlorine output level indicator past 50%. ( winter level ) it is now Summer here in Australia. Cleaned all electrical connections at cell. I measure 9 volts coming out of transformer but only 3 volts at cell the voltage drops at the heat sink , is this amount of drop correct. The black lead/ plug at the cell gets rather hot pretty quickly, bubble test with cell in a bucket of salt water looks ok. Any suggestions or advice would be greatly appreciated. Thanks