Will be 5th year on Hayward Aqua Rite (T-9). Its been in +700 CH water for at least 3 of those years. I have since just drained/filled. Water is testing at 3200 with taylor drop test. Cell is reading 2400 consistently now and stays at that after resetting at the console. Salt and inspect cell flash after resets. I'm assuming it's about dead. Take it into store and have it tested? Its cold water, 55 degrees so its right on the edge of producing anything but want to see about new one. Should I just replace with same model or is there something "better" out there now?