# Possibility to measure water hardness

**URL:** <https://discourse.nodered.org/t/possibility-to-measure-water-hardness/57454>\
**Category:** Hardware\
**Created:** [29 January 2022 11:41 UTC](https://discourse.nodered.org/t/possibility-to-measure-water-hardness/57454 "2022-01-29T11:41:27Z")\
**Posts on this page:** 5\
**Page:** 2

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**Author:** ![TheadehAnank](https://avatars.discourse-cdn.com/v4/letter/t/7ea924/32.png) [@TheadehAnank](https://discourse.nodered.org/u/TheadehAnank)\
**Post date:** [29 January 2022 21:46 UTC](https://discourse.nodered.org/t/possibility-to-measure-water-hardness/57454/21 "2022-01-29T21:46:05Z")

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@BartButenaers - I don't know if its even possible to measure the salt content post treatment; its just a thought but more research would definitely be needed. I think the salt content in softened water is quite low, and you might have to compare it to the level in the pre-treated water then look for a difference. Seems to me that if there are sensors capable of doing this, then as prevalent as water softeners are, the sensors would be readily available and marketed for such use.

Regarding pH & hardness, I believe that for water softener systems to work effectively the water must be within a certain pH range. If outside that pH range, then the pH as to be treated before the hardness can be treated. That may be the source of the confusion.

[Terry Love Plumbing Advice & Remodel DIY & Professional Forum](http://TerryLove.com/forums) is a great site for these matters. Another might be pool/spa treatment, since they often use salt to generate chlorine. [TroubleFreePool.com](http://TroubleFreePool.com) has a lot of info and forums that might be worth reviewing.

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [29 January 2022 21:56 UTC](https://discourse.nodered.org/t/possibility-to-measure-water-hardness/57454/22 "2022-01-29T21:56:59Z")

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> [@ghayne](#):
>
> I'm taking my pills as we speak!

That sounds like a good plan 🙂

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**Author:** ![Bobo](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bobo/32/8401_2.png) [@Bobo](https://discourse.nodered.org/u/Bobo)\
**Post date:** [30 January 2022 00:39 UTC](https://discourse.nodered.org/t/possibility-to-measure-water-hardness/57454/23 "2022-01-30T00:39:10Z")

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> [@BartButenaers](#):
>
> Ok, so here is my next water related noob question. Are there decent affordable sensors to measure water hardness in some way

Some dishwashers measure hardness (ours certainly does), so it is possible. Not sure what type of sensor it uses though.

So, I'm no help 😆

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**Author:** ![Sean-McG](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/sean-mcg/32/54677_2.png) [@Sean-McG](https://discourse.nodered.org/u/Sean-McG)\
**Post date:** [30 January 2022 01:52 UTC](https://discourse.nodered.org/t/possibility-to-measure-water-hardness/57454/24 "2022-01-30T01:52:39Z")

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I notice that the boy seems to be glowing 💀

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [31 March 2022 01:53 UTC](https://discourse.nodered.org/t/possibility-to-measure-water-hardness/57454/25 "2022-03-31T01:53:28Z")

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Closed on 31 March 2022 01:53 UTC

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