Why is it that Stanley owners never take care to select soft water, and yet are not troubled with sediment?
Because the water returned from the condenser is distilled water, and it is thus used over and over again, so that the sediment is slight. Furthermore, ample provision is made to get rid of it, as the whole area of the boiler is in close proximity to the blow-off valves. In ordinary boilers the area of sediment is too great to be entirely reached.
