high pH, high kH, low gH - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-13-2011, 04:44 AM Thread Starter
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high pH, high kH, low gH

From what I measured and calculated from the water quality reports, my tap water parameters are 8.4 pH, 411 ppm (22 degrees) kH, and 11 ppm (1 degree) gH. Does this make any sense? What plants will thrive in this (anacharis, hornwort, vallis maybe)?
Also, would these parameters and the 553 ppm total dissolved solids lead to my difficulty with cloudy water?
Thanks for your help.
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post #2 of 7 (permalink) Old 06-13-2011, 03:10 PM
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It is hard to believe that your water has 22 dKH and 1dGH. Do you have a link to the water quality report?

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post #3 of 7 (permalink) Old 06-13-2011, 04:34 PM Thread Starter
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Yeah the neighboring town has 25* kH and 0* (yes zero) gH!
Here's a link:
http://www.bryantx.gov/fetch.html?na...ar_web_res.pdf

It is very strange, but true oddly enough. And I wondered why my gH test kit never changed color!
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post #4 of 7 (permalink) Old 06-13-2011, 09:31 PM
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If nothing else, that is the most entertaining water quality report I recall seeing. It looks like there is a lot of sodium bicarbonate in the water, which would give a high KH without having a high GH. I wonder if that much sodium is a problem in planted tanks. Without much knowledge that I can recall, that seems like it is getting up into the brackish water range.

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post #5 of 7 (permalink) Old 06-13-2011, 11:07 PM
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Their website said they draw from an aquifer over 2000 ft down and the water is hot enough they have to cool it before treatment. They do not soften it seems, just aeration and chlorination. Bicarbonate can be busted with an acid (think CO2 is the biproduct, think science experiment volcano) but I doubt it is feasible or wise to do such when it comes to aquariums. Boiling I believe will precipitate carbonate, maybe bicarbonate, but again not practical.
The alkalinity is over 400 ppm also, which the main factors in ground water is carbonate and bicarbonate.

I would check the other years WQR also, would be funny if it was a typo. Their other annual WQR are funny too, like Montly Water Crue and a Pirates of the Caribbean themed one. I will have to show the boss how much fun we are missing out on, our WQR/CCR are quite dull and still no where as comprehensive.


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post #6 of 7 (permalink) Old 06-14-2011, 06:39 AM Thread Starter
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All of the other years are similar, and the neighboring town shows similar results. Strange. I guess I should get a gH booster (obvious is obvious). It would be nice if I could get the pH and kH just a little lower, though.
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post #7 of 7 (permalink) Old 06-15-2011, 12:52 AM
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I don't think there is a good way to reduce the KH, other than by diluting it with RO/DI water. You may be one of the small minority who really do need to use RO/DI water.

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