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Remove as much scale as possible by hand. Dissolve any scale that is difficult to remove by using a de-scaling solution. Remember to replace the drain plug before using the de-scaler. Clean the level sensing probes and their white holders completely using a clean non-metallic scourer. Ensure all traces of de-scaler are removed before using the boiler again. Rather than frequently de-scaling the machine, it may be preferable to install an effective scale reducer or WRAS approved food quality wate