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The float mechanism works perfectly. The water flow never stops; it constantly runs, and we had to shut off the stopcock to avoid waste. It's a mezzanine floor; the internal patio drain doesn't clear properly, and the downpipe is poorly constructed. We believe the entire installation needs changing. Every time it rains, we get flooded. 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 leaks into the bowl, and the tank seems to never stop filling. The stopcock is next to the tank.
