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    Which one? - Sentinel Deposit Remover, Sentinel X400, Fernox F5, Everbuild P11

    I've got a 10-radiator open-vented system. I've drained it down and some of the water (15% perhaps) contained black sludge. I have taken one of the radiators off and flushed it through outdoors with mains pressure water. I'm happy that this rad is now clear but the other 9 probably aren't, so...
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