serotoninsid
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4bed semi-d with three wc's. When anyone of them is flushed, there is a loud 'gluging' sound as they refill (since the last week or so) - and the bowls fill up with water for a couple of seconds and go back down again after a few seconds. The downstairs wc is (as of this morning) filled up and will not clear.
Any idea what this might be?
Any idea what this might be?