What would cause a backfliw toilet to overflow when it rains? Nefew just asked me. He said his toilet drain is thru the wall.
Backflow toilet
May 28, 2021
Last reply: 5 years ago
1 Replies
Ask nephew where the drain line runs and at what level. Could be the drainpipe is filling up from other stuff draining into it and backing into the toilet. Could be downspouts going into the drain for instance. It is septic or sewer system?
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