I will not advise the use of any of
these preparations, for several reasons. In the first place, certain
chemicals will successfully remove the scale formed by water charged
with bicarbonate of lime, and have no effect on water charged with
sulphate of lime. Some kinds of bark-summac, logwood, etc.,-are
sufficient to remove the scale from water charged with magnesia or
carbonate of lime, but they are injurious to the iron owing to the
tannic acid with which they are charged. Vinegar, rotten apples, slop,
etc., owing to their containing acetic acid, will remove scale, but this
is even more injurious to the iron than the barks. Alkalies of any
kind, such as soda, will be found good in water containing sulphate of
lime, by converting it into a carbonate and thereby forming a soft
scale, which is easily washed out; but these have their objections, for,
when used to excess, they cause foaming.
Petroleum is not a bad thing in water where sulphate of lime prevails;
but you should use only the refined, as crude oil sometimes helps to
form a very injurious scale.
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