: We have a basement level toilet that periodically overflows (depending on what the waste is, of course).
: It was snaked by a professional, however, it seems nothing substantial was dislodged.
: The problem continued. A different toilet on the same level whose drain is upstream of the overflowing
: toilet's drain (in the in-law unit) has never shown the same problem. Plunging will occasionally cause
: sewage to back-up into the shower drain in the same bathroom. After plunging, it will operate normally
: again for some days until the entire process repeats. We have been advised that a new toilet may
: solve the problem. We have tried two different toilets, both of which could be described as low quality,
: bargain units. Suggestions? Thanks,
: -Tim

Tim,
Good toilets are a help, but the sewage backing into the shower is not a good sign. That sounds more like a main drain problem. A common problem with toilets is stuff hanging up at the lower part of the trapway of the toilet. You can see from the picture, that it goes flat for a while, and sometimes there is a bit of a rough lip around the exit that will catch all matter of toys, bottles and pens. Terry