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Hi, a question came up at work today as to how often you should take water out of a boiler to prevent sludge build up.There was two different opinions,one was that if you are using a probe type low water cutoff there is no need to drain boiler on a weekly basis and said that by adding fresh water all the time you are decreasing the life of the boiler.Another guy said you should take a gallon or two out every week.Whats the correct answer bearing in mind you are using a probe lwco.Thanks