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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 type). Now it leaks 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 properly and the downpipe is poorly constructed, we believe the entire system needs replacing. Every time it rains, we get flooded. This is a communal issue, 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.
