6dKH 6dGH but pH 8.4.. Any idea how? Also water change question. - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 12-11-2013, 05:23 PM Thread Starter
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6dKH 6dGH but pH 8.4.. Any idea how? Also water change question.

So my tap water is hard:

KH 16
GH 17
TDS 280

I would expect the pH to be pretty high but I've been mixing it 50/50 with RO water and adding it to my tank with new Aquasoil which buffers it down to KH 5-6 and GH 6-7, if I let the tank water sit in a dish for 24 hours the pH measures 8.4 which seems unusually high to me. I tried calling the local water company to ask what they're doing to it but they never got back to me.

Does this seem normal? I thought it would be pretty easy to get the pH down some mixing RO and the aquasoil buffer..

The second part of my question is water changes: Does the result of the aquasoil buffered water's lower GH/KH pose a stress issue for fish and shrimp when replacing with un-buffered water? It's about KH/GH 8-10, TDS 190
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post #2 of 8 (permalink) Old 12-17-2013, 07:25 PM
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Phosphates can screw with your pH as well, I know when I lived in Utah my phosphates ran 2-4 ppm out of the tap and I had pH that high without CO2 supplementation.

Not sure about the 2nd question, sorry.

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post #3 of 8 (permalink) Old 12-17-2013, 08:54 PM
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Quote:
Originally Posted by Guyver View Post
Phosphates can screw with your pH as well, I know when I lived in Utah my phosphates ran 2-4 ppm out of the tap and I had pH that high without CO2 supplementation.

Not sure about the 2nd question, sorry.
can you explain how po4 could raise the ph? because i couldnt think of any.
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post #4 of 8 (permalink) Old 12-18-2013, 12:20 AM
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Quote:
Originally Posted by happi View Post
can you explain how po4 could raise the ph? because i couldnt think of any.
I don't think phosphates will raise pH, but they will definitely buffer it to some degree.

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post #5 of 8 (permalink) Old 12-18-2013, 12:55 AM
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Your waterworks add various chemicals in the water to raise the pH so to protect the pipes.
Go on your local waterworks' website. Everything should be listed.

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post #6 of 8 (permalink) Old 12-18-2013, 02:19 AM
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Originally Posted by Darkblade48 View Post
I don't think phosphates will raise pH, but they will definitely buffer it to some degree.
ok that make more sense
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post #7 of 8 (permalink) Old 12-18-2013, 05:41 PM Thread Starter
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Here's the water quality report, I didn't find it very helpful other than they add polyphosphates to suspend particles in the water.

http://www.oswegoil.org/pdf/2012%20W...y%20Report.pdf
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post #8 of 8 (permalink) Old 12-19-2013, 05:43 PM
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polyphosphates are weak bases according to wiki. That could be the source of high pH.

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