You should "spike" all your sewer connections. All you need to do is dig down about 6 inches along the side of each connection and put thin wire thru the middle of the PVC. The fancy way to do it is drill small holes and use stainless steel wire. The fast, easy way, (my way) is to run a 6 inch fencing screw across.
Waste will easily pass over the spike, however sewer hoses, connectors, tennis balls dropped in by children and the like will hang up. So will diapers, wash cloths and other assorted things people think can be flushed, but can't. Much easier to fish them out 6 inches into the pipe than from who knows where in the main lines.
