# Can Someone Clearly Explain Dgh/kgh For Me?

#### gray_matter16

I'm getting frustrated that there doesn't seem to be a standard out there for describing, calculating or reporting on GH and KH versus ppm. Can someone please give me a diagram or clearly explain this to me?

- I have heard 1 dGH = 17.9 ppm, is this accurate?
- My test kit instructions use [degrees symbol], is this equivalent to dGH/dKH?
- Also in my test kit instructions, the dGH scale is the same as the dKH scale, is that right?
- Is there a difference between gH/kH and dGH/dKH?
- When I see other threads posting water hardness values, they rarely post the unit of measure. For example, if someone says their GH = 6, do they mean 6 dGH? Which would be 17.9*6 = 107 ppm? Do I have this right?

#### Chanyi

Yes you have everything right.

gH = 6 is the same as 6 degrees of gH.
gH = 160ppm is ~ 9 degrees gH (160ppm / 17.9 = 8.94)

#### Momgoose56

- I have heard 1 dGH = 17.9 ppm, is this accurate?
- My test kit instructions use [degrees symbol], is this equivalent to dGH/dKH?
- Also in my test kit instructions, the dGH scale is the same as the dKH scale, is that right?
- Is there a difference between gH/kH and dGH/dKH?
- When I see other threads posting water hardness values, they rarely post the unit of measure. For example, if someone says their GH = 6, do they mean 6 dGH? Which would be 17.9*6 = 107 ppm? Do I have this right?
1. "1 dGH = 17.9 ppm, is this accurate?"
YES and 1 dKH = 17.9 ppm
2. "My test kit instructions use [degrees symbol], is this equivalent to dGH/dKH?"
YES
3."Also in my test kit instructions, the dGH scale is the same as the dKH scale, is that right?"
YES
4. "Is there a difference between gH/kH and dGH/dKH?"
Yes there is a difference. The "d" stands for "degree" and refers to the fact that you are using the "degree" scale. So if you get a measurement of 4 dGH it is the same as 71.6 (ppm)GH.
5. "...if someone says their GH = 6, do they mean 6 dGH? Which would be 17.9*6 = 107 ppm? Do I have this right?"
YES But technically if they mean dGH, it should be expressed as dGH rather than GH. With a number is that small, when measuring hardness though, it is usually assumed the publisher is referring to "degrees" rather than "ppm".

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