Usually when I flush the water level goes up a little bit, but for some reason now it goes a lot higher than normal (not enough to overflow) and when it's finished flushing, and it returns to normal water level when it is not is use, the water level doesn't seem to be any higher than it has ever been, as if there isn't a problem with it. can anyone help? I don't think it's deeper in teh drainage because I have run the taps and the bather and the water goes down teh sink as normal.
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