Low KH/GH with very high pH - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 02-19-2005, 05:27 AM Thread Starter
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Low KH/GH with very high pH

Ok, I live in the wonderful Bay area, and I've recently learned that our city water is a combination of water piped in from the Sierra Mountains and mixed with water from local aquifers. I did some research and found the water quality report for my city

http://sanbruno.ca.gov/city_services...PW_CCR2004.pdf

I then did reading in these forums and on thekrib and concluded (someone correct me if I am wrong) that the numbers for Alkalinity correspond with KH and the numbers for Hardness correspond with GH. The numbers for the combined local and piped in water read like this:

Alkalinity 49ppm /17.9 = KH 2.73
Hardness 51ppm /17.9 = GH 2.84
pH 9.0

I thought the Kh and Gh were good, but the pH is really strange.

What could cause this really high pH?
Will aerating this water bring down the pH to a usable range?
Is an approximate KH of 3 a high enough buffer?
I dont have any testing equipment, and I'd like to buy a kit. I only want the basics. What is a quality brand for tests kits and which kits should I get to have the basics covered?
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post #2 of 7 (permalink) Old 02-19-2005, 06:40 AM
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That doesn't even seem possible? Have you tested your ph?
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post #3 of 7 (permalink) Old 02-19-2005, 08:39 AM
Stu
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In the first table (annual water report), the values seem more normal...
Quote:
KH = 156mg/l = 8
GH = 222mg/l = 12
pH = 7.97
I'm not sure what the last table is really about.

As for test kits, what did you want to measure?
pH, KH and GH are very basic tests and any brand of kit will be sufficient. (I use a pH meter and Hagen hardness kits through personal preference)


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post #4 of 7 (permalink) Old 02-19-2005, 12:50 PM
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It sounds like the city is adding some type of peroxide to raise the pH so there is no pipe damage.
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post #5 of 7 (permalink) Old 02-19-2005, 06:30 PM Thread Starter
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time to experiment

Has anyone ever heard of someone having this abnormally high pH problem?

I guess I just need to fill a bucket and start experimenting. I found a post where someone aerated their water for 24 hours prior to adding it to the tank, and the addition of oxygen brought the pH down.

I don't have any test kits yet. I really dont want to head down to petco and get something crappy. I avoid that place if I can. I was looking at Dr's foster and Smith and I think i'm going to purchase Hagen individual test kits unless anyone can recommend anything else or to purchase from another website.
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post #6 of 7 (permalink) Old 02-19-2005, 11:43 PM
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I have heard of it from several people. That's why I said it sounds like they are using some sort of peroxide to raise the pH to avoid pipe damage.
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post #7 of 7 (permalink) Old 03-06-2005, 04:11 PM
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This is actually what I am dealing with here, The cold whater has very high Ph, about 8,5 and is very soft. KH about 2ppm The Ph dropps very rapidly, but there is nothing added to the water to raise the PH levels. The hot water has even higher Ph, about 9 but is a bit harder, about 40ppm.
The cold water is springwater but the hot is geothermal. So Ill be trying to mix luke warm water and see how it works.

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600 ltr (160g) planted tank. Pressurized CO2, Eheim 2260 & Sacem Marathon 2000, 156W T5.
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