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It's a mezzanine floor, the internal patio drain is blocked and the downpipe is poorly constructed, we believe the entire installation needs replacing. Every time it rains, it floods. This is a communal work, we need a quote for the community president. 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's leaking water into the bowl and the tank never seems to stop filling. The stopcock is next to the tank. The float mechanism works perfectly. Water keeps running constantly, and we had to close the stopcock to avoid wasting water.
