water descaling unit
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Water softening — A water softener reduces the dissolved calcium, magnesium, and to some degree manganese and ferrous iron ion concentration in hard water.These hardness ions cause three major kinds of undesired effects. Most visibly, metal ions react with soaps… … Wikipedia
Hot water storage tank — 2 parallelled red hot water storage tank connected to a wood furnace … Wikipedia
Hydrochloric acid — IUPAC name Hydrochloric acid[ … Wikipedia
