[homoeccentricus]

Damn, two variables in an equation, an infinite number of solutions.

[homoeccentricus]

Also hardness (expressed as ppm CaCO3) is not exactly the same as ppm of the ions.

Hardness =  (Ca ppm) * 2.5 + (Mg ppm) *4

Your formula is for permanent hardness. Would be around 32 ppm Ca and 5 ppm Mg. But do we know that the 100 ppm is permanent hardness?

Just asking for fun now. If I brew this I'll just use an APA or IPA profile with demi water.

[narvin]

Also hardness (expressed as ppm CaCO3) is not exactly the same as ppm of the ions.

Hardness =  (Ca ppm) * 2.5 + (Mg ppm) *4

Your formula is for permanent hardness. Would be around 32 ppm Ca and 5 ppm Mg. But do we know that the 100 ppm is permanent hardness?

Total hardness is what is I posted above, and is the concentration of Ca and Mg.  Alkalinity is carbonates. Temporary hardness is the portion of Ca and Mg that is balanced by carbonates and can be removed by boiling.  Permanent hardness is the rest, what cannot be removed by boiling.

Total hardness is what Mitch is talking about, I assume.

[narvin]

 Also, if you experience permanent hardness (or more than 4 hours of it) you should see a doctor.

[CVas]

There is also something called "nano filtration" which is selective type of filter.  That said, I wouldn't worry too much about Stone's process, what matters is YOUR water.  If you have 300ppm hardness then you will likely need to do something similar to Stone and dilute.  However if your water is 150ppm or less then no need to dilute and you can treat with just acid.

How do you measure ppm?

[homoeccentricus]

Also, if you experience permanent hardness (or more than 4 hours of it) you should see a doctor.

Now I need a therapist AND a bartender

[homoeccentricus]

There is also something called "nano filtration" which is selective type of filter.  That said, I wouldn't worry too much about Stone's process, what matters is YOUR water.  If you have 300ppm hardness then you will likely need to do something similar to Stone and dilute.  However if your water is 150ppm or less then no need to dilute and you can treat with just acid.

How do you measure ppm?

It's the same as milligram per liter.

[JJeffers09]

Also, if you experience permanent hardness (or more than 4 hours of it) you should see a doctor.

Now I need a therapist AND a bartender

Or a really good night...

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