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Sewage backs into the shower when the toilet is flushed
We rent a basement suite. Today, the shower didn't drain. When the toilet was flushed, sewage backed into the shower. The toilet water rose, and did Not overflow and skowly went back down, however, the water in the shower continued to rise. The upstairs suite, when the toilets are flushed have no affect on the sewage rising in the shower. A plumber came, said it was not a blocked toilet and that someone would come on Monday to see the problem better. Any ideas?