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post #1 of 6 (permalink) Old 08-03-2017, 03:17 PM Thread Starter
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Measuring kh

If i use tap water exclusively should I just test my tap waters kh so I dont get any false readings? Or should I use my aquarium water? I'm trying to find a max safe co2 for my aquarium via kh/ph/co2 chart and going from there.
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post #2 of 6 (permalink) Old 08-03-2017, 03:34 PM
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If i use tap water exclusively should I just test my tap waters kh so I dont get any false readings? Or should I use my aquarium water? I'm trying to find a max safe co2 for my aquarium via kh/ph/co2 chart and going from there.
If you are using the chart you test the KH from the aquarium. We assume your tap and aquarium KH should be similar but just measure the tank.
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post #3 of 6 (permalink) Old 08-03-2017, 05:43 PM Thread Starter
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Does Kh change with drift wood and substrate?
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post #4 of 6 (permalink) Old 08-03-2017, 05:47 PM
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From your aquariums degassed ph, a drop of one whole ph point should be about right for co2 levels. I always test my tap and my tank, this eliminates overlooked variables.
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post #5 of 6 (permalink) Old 08-03-2017, 06:02 PM
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Does Kh change with drift wood and substrate?
Yes they can, not always though. Driftwood releases what are known as tannins. One form is tannic acid. Almost any acid will lower KH. However tannic acid is a weak acid and the amount your driftwood releases will have a very minimal effect assuming its not a huge part of your tank. Also over time I would suspect the diffusion rate will slow as your driftwood is not an infinite source of tannins.

Active substrates like aquasoil or controsoil are actually designed to remove K (usually they are used in conjunction with RO water which doesn't have any KH to start with). As a side effect GH is often also lowered with these but at what I suspect is a much slower rate. If you are just using dirt or eco-complete or something with sand or gravel it should not effect your water parameters in any significant way.

As an aside, some rocks can also effect KH.

Bump: Are you trying to adjust your KH before you add CO2 to attain what you think are good levels? I can provide some insight to this stuff if you would like, but keep in mind changing your KH will change your PH and a low kh of around 2 and lower leads to a very unstable PH.
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post #6 of 6 (permalink) Old 08-06-2017, 09:03 PM
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Ignore the pH/KH/CO2 relationship. It's only accurate under a very strict set of circumstances that are never found in an aquarium.
If you're not using an automated CO2 injection system based on pH, ignore pH/KH completely (with respect to CO2 injection).

If you want more CO2, add more.

Feel free to edit.
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