Measured GH and KH levels for first time... - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 03-16-2006, 11:24 PM Thread Starter
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Measured GH and KH levels for first time...

....so what does this mean?? I have 2 Hagen CO2 bottles run on one ladder, but no pressurized.

GH- 322.2 ppm
KH- 214.8 ppm

So, do I have liquid rock or what? lol

Sorry for my ignorance, couldn't turn up anything with search.
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post #2 of 6 (permalink) Old 03-16-2006, 11:56 PM
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Divide it by 17.8 to get to more commonly used degrees.

Yep, pretty hard water there... Great for African Rift Lake Cichlids, okay for most plants. No need to add Calcium or Magnesium!


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post #3 of 6 (permalink) Old 03-17-2006, 01:20 AM Thread Starter
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So, what can I expect when I start running pressurized CO2?

I tested my tap water, just out of curiousity, and the KH was 11, GH was 13. Hmmmmm....I do add Magnesium with my other dry ferts, can't say it's doing anything for the plants, but it sure looks like it's raising the hardness, huh? Boy, oh boy.....I think I'll stop adding the Magnesium.
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post #4 of 6 (permalink) Old 03-17-2006, 02:29 AM
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Go track down a standard KH/pH/CO2 chart. Injecting CO2 should really alter the KH/GH values, but the KH level will dictate your desired pH level, typically around where CO2 ppm is around 30. Aged water (let it sit in a glass for 24 hours) should have CO2 ppm around 3. I'm guessing that will be close to 8.1 or so with KH=11. Then you'll want a target pH around 7.0 to 7.1...but this is where you really need the table.

Definitely stop adding the Mg, unless you discover a deficiency that requires it...and you most likley won't.
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post #5 of 6 (permalink) Old 03-17-2006, 01:26 PM
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Quote:
Originally Posted by Wasserpest
Divide it by 17.8 to get to more commonly used degrees.

Yep, pretty hard water there... Great for African Rift Lake Cichlids, okay for most plants. No need to add Calcium or Magnesium!
Unless he checks with his water utility company he cannot be certain that all of his GH doesn't in fact come from Ca only.

Probably he's okay, but it's certainly possible he could still wind up with Mg deficiences.

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post #6 of 6 (permalink) Old 03-17-2006, 08:57 PM
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Quote:
Originally Posted by banderbe
Unless he checks with his water utility company he cannot be certain that all of his GH doesn't in fact come from Ca only.
Yeah, I'd agree with that!

My Ca to Mg ratio is around 8:1 and my GH along with TDS has been fluctuating just lately. We've not had that much rain in the UK over recent months and I think my water company must be dragging water in from different sources. GH has bounced around between 3-10 over the past month or so.
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