[1retired06]

Unfortunately, most of us have found the OEM monitors unreliable. Inside the tank, they fail because of exposure to soap, sewage, etc. You can find better quality ones on Amazon; we have never bothered to change them out. If grey water starts to back up, or our toilets start to burp, we know it is time to dump. Snowbirding here in Florida we have found dumping all four of our tanks weekly works well for us. The Fresh water tank monitor is far more reliable for obvious reasons.