1. The boilers do not need to be cleaned during a whole season, as they
remain entirely free from incrustation; it is only required to avoid a
collection of soluble salts in the boiler, and therefore it is partly
drawn off twice a week.
2. The iron is not touched by this purified water. The water does not
froth and does not stop up valves. The fillings in the joints of pipes,
etc., do not suffer so much, and therefore keep longer.