| Comment | A lot of people do not know this but when you plunge a bath or sink drain, you have to block the overflow with something - I usually use a wet rag. Otherwise you're just plunging water around between the drain and the overflow. Shower trays don't have an overflow though.
Actually if grey water is coming up while you are not running the shower, then it's a problem with the drain below your bathroom. Are you in a flat? If so it's a factor issue and the bill will be split by all flats. If it's a house, then yeah bad times. |
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