Rid-X is for septic tanks last I heard. It does not work fast like Happy Camper. I dump like once a week both tanks and no smell at all. But I have seen some in RV parks when they dump, they just about run the neighborhood out of the park. They use just water and not much at that. So they get all kinds of problems with toilet pyramid problems because of the lack of water. Stinky all around, no enzymes to eat up the waste.
Some are just stubborn and will not do it. Not even for the sake of the guy parked right next to them. LOL!