Why does GH/KH/PH goes up after a while? - Page 2 - The Planted Tank Forum
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post #16 of 18 (permalink) Old 10-15-2020, 01:57 PM
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Originally Posted by ahem View Post
In the scenario I am talking about, you would not reset the kH back to default at water changes. At the water change you would add a product like Seachem Alkaline Buffer. It raises the pH and kH which prevents the Seiryu rock from dissolving into the water the column, thus preventing pH/kH drift, or at least that is the hypothesis.

The hypothesis can be tested by adding Seiryu to buckets of water of different pHs/kHs and seeing if there is a difference in pH/kH drift over time (presumably caused by Seiryu dissolving into the water column).
Aquarium plants especially the ones in our hobby tend to do better in lower kH. Atmospheric CO2 can chew through kH as well, try leaving out water with high kH you will notice over time the pH drops.


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post #17 of 18 (permalink) Old 10-15-2020, 04:06 PM
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Originally Posted by cl3537 View Post
Aquarium plants especially the ones in our hobby tend to do better in lower kH. Atmospheric CO2 can chew through kH as well, try leaving out water with high kH you will notice over time the pH drops.
It's not a ideal situation for sure but what I am pointing out is a possible way to have stable pH so that one does not have to worry about pH/kH drift throughout the week. There are tradeoffs in everything.
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post #18 of 18 (permalink) Old 10-15-2020, 08:38 PM
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Originally Posted by ahem View Post
It's not a ideal situation for sure but what I am pointing out is a possible way to have stable pH so that one does not have to worry about pH/kH drift throughout the week. There are tradeoffs in everything.
You have it backwards, pH and kH don't have to be stable to run a successful healthy tank, but estimating and keeping an appropriate CO2 level is important.

The problem with Seiryu stone is just estimating a proper CO2 rate, once its done and with a decent needle valve the flow rate should remain constant and you don't have to touch it for weeks or months. You may have to reset the equilibrium once the Seiryu stops raising kH if your pH drops too low but that takes a long time.


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