Low pH but high KH? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 02-28-2014, 07:33 PM Thread Starter
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Low pH but high KH?

Tested my water and the pH was 6.8 and the KH was 14 degrees and GH was 16 degrees! I thought hard water generally raised pH. Why is mine not like that?
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post #2 of 6 (permalink) Old 02-28-2014, 09:54 PM
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Adding CO2? I have seen water directly out of the tap produce similar results and after off gassing the CO2 from being under pressure buffered back to its normal Ph.

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post #3 of 6 (permalink) Old 03-01-2014, 12:34 AM
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Bad tests?

Are you using the regular range pH test? This is only valid up to about 6.8, and will show 6.8 even if the pH is really higher.
Test using the high range pH test. This will test into the 7s, and a bit higher, if I remember.
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post #4 of 6 (permalink) Old 03-01-2014, 01:43 AM
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The low range ph test (API), test up to 7.6. Are you using strips, by chance?

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post #5 of 6 (permalink) Old 03-01-2014, 02:39 AM Thread Starter
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I do add co2 and there is driftwood and dirt so I guess that could lower it. But it seems like that is a very low pH for such a high KH. I have your regular API test kit with test tubes and solutions and what have you. The pH test is almost impossible to tell the differences...seems like they're all slightly varying shades of blueish yellow. Just did the high range and it turned a lighter brown than the lowest reading of 7.4. So I guess it's possible it could be higher than 6.8....just so hard to tell the difference in color.
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post #6 of 6 (permalink) Old 03-01-2014, 03:40 AM
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I might agree that that ph is low for that high of a kh if you were not adding CO2.

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