Making sense of water hardness

D.M. Procida · 2025-07-05T09:25:42+00:00

I have an IKEA diswasher manual in front of me, like that it advises not to store explosives in it (page 5). but I ambaffled by the table on page 8.It says that "average"(?) water hardness is 12-16 ˚dH. says that12-16 ˚dH is deep into very hard territory.Our actual water hardness here is apparently between 5 and 9 ˚dH, and all thesigns are that it is pretty hard (limescale forms at the slightestopportunity).The paper version of my manual just adds to the confusion.So I am not really any clearer.Daniele

Jul 05, 2025 Last reply: 1 year ago 21 Replies

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The Natural Philosopher 1 year ago

Way less than there was in the 1950s

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Sam Plusnet 1 year ago

Better dealt with by offering a discount on the cost of providing water I should think, but the water company would argue that they have higher operating costs since their pipes need more maintenance[1].

[1] Note I said they need it, not that they get it.

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