combining seiryu stones and aquasoil - ph, and hardness in the water - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 09-15-2015, 03:32 AM Thread Starter
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combining seiryu stones and aquasoil - ph, and hardness in the water

Is the ph/kh increase from seiryu stones significant compared to aquasoil? And does seiryu stone affect water parameters infinitely?

Since aquasoil loses it's buffering capability over time, wouldn't this mean in a few years, the seiryu stone would end up gradually making the water very hard and alkaline? (This is assuming hard and alkaline tap water is used for water changes(ph 7.8, kh 7, gh10)
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post #2 of 3 (permalink) Old 09-15-2015, 04:03 AM
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I'm not sure on the stones specifically, but buffers have a pH they like to buffer at. For NaHCO3 (sodium bicarbonate) that is around pH 8.0. So you can raise the pH of water with NaHCO3 to 8.0, at which point adding more won't increase pH further, only increase KH.

Since the rock will be a carbonate source, it's likely to want to buffer at pH 8.0-8.2. And since your tap water is 7.8, any pH concerns are not worth the time.

Leaving the only real issue as TDS (KH), which simply means you might want to pay some attention to water parameters during water changes. But since your KH is high from the tap, this isn't even going to be an issue worth time unless you wait an extremely long time between water changes.

The rock will continue to affect water parameters while it's in the water. You can increase the rocks affect by lowering the water pH to an acidic state, since this will dissolve the rock faster, meaning it will release it's carbonate source faster. But since you have alkaline water, the rock will likely take years to decades to fully dissolve. That slow rate of dissolution, also means a slow rate of releasing it's contents into the water.

I'm not sure on the specifics of the aquasoil, but since the rock and the tap water have mutual parameters, it's probably the effect of the aquasoil you should be concerned about, not the rock.

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post #3 of 3 (permalink) Old 09-15-2015, 10:45 AM
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Judging from the aquasoil marketing, it doesn't buffer the water, instead, it removes buffer compounds from the water. Not sure what it's doing with the calcium/magnesium, but it will be reacting with the (bi)carbonate to form carbonic acid. Carbonates like to buffer alkaline, and carbonic acid likes to buffer acid.

The rock appears to be calcium carbonate or some other form of carbonate. So this will dissolve with the increase of carbonic acid, releasing carbonate into the water, but not at a rate to offset the effects of the aquasoil by itself.

As soon as the aquasoil loses it's ability to convert more (bi)carbonate to carbonic acid, the water will revert to the same parameters as the tap water. As I mentioned above, the rock doesn't do anything significant to your current tap water.

https://en.wikipedia.org/wiki/Bjerrum_plot

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Last edited by Audionut; 09-16-2015 at 12:01 AM. Reason: add link to Bjerrum plot for those following
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