I have a Hayward Aqua Rite pro with sense and disense.  I have balanced the pool and checked the  results with my Taylor K-2005-Salt wet chemistry test kit.  The Aqua Rite maintains the ph perfectly with CO2.  The ORP sensor is new but when it starts the salt chlorinator the ORP reading goes down instead of up and the ppm of chlorine overshoots and the chlorinator does not shut off.  Can you help?