Dissolved in water the salts deposited on the walls of the vessels for boiling in a permanent scale, which is difficult even mechanical cleaning. However, the scale is well softened and then deleted if the capacity to put potato peelings: after boiling the precipitated salt is easily scraped off with a wooden spatula.
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Love your magazine and want to share with readers his "invention". A similar device was published in the magazine, but mine is more versatile. And took it when I had to lay down a brick...