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It's an old backpack cistern; the flat is from the 60s. Two years ago I replaced the flush valve with a new one (the blue and white plastic kind). Now it leaks water into the bowl and the tank seems to never stop filling. The stopcock is next to the tank. It's a mezzanine floor, the internal patio drain doesn't clear and the downpipe is poorly constructed, we think the whole system needs replacing. Every time it rains we get flooded. This is a communal job, we need a quote for the community president. The float mechanism works perfectly. The water outlet never stops, it constantly keeps running and we had to close the stopcock to avoid wasting water.
