We have a septic system, it uses chlorine tablets and an auto paddle to keep agitated and we have a red light that comes on if there is a problem (way back in a closet so who sees it anyway) I think anything that can be flushed has been! We don't use RidX but have the system checked every year and so far it hasn't had to be pumped but once in over 20 years. The one thing that was found that wasn't broke down was plastic straws. I'm careful not to have any in the dishwasher anymore.