How to convert KH to KH? or whatever it is? - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 06-13-2014, 04:22 PM Thread Starter
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How to convert KH to KH? or whatever it is?

Trying to estimate my CO2 levels. Im using API dipsticks. KH reads between 240 and 180. Let's just say it's 210. How does that translate to the KH values on this chart, for example..

TIA



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Last edited by burr740; 06-13-2014 at 04:50 PM. Reason: ,.
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post #2 of 13 (permalink) Old 06-13-2014, 05:59 PM
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Just read that you divide the ppm by 17.9. Google is the winner? for this one so you may want to double check.
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post #3 of 13 (permalink) Old 06-13-2014, 06:13 PM Thread Starter
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So 11.73?

PH is 7 so that's showing CO2 = ~35 ppm. That cant be right, way too high. See this thread for reference.. https://www.plantedtank.net/forums/sh...d.php?t=659290

Im not disputing your answer, and I thank you very much. I knew there was a multiplier just couldnt find it. But it just doesnt seem right that I'd be getting that in a 75 gal w/DIY CO2 consisting of only 3 2L bottles.

Using the Degas PH method, there is in fact a difference of a whole 1.0. So maybe I am seeing ppm in the low 30s atm.

Holy crap if that's true! Thanks again for the answer.


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post #4 of 13 (permalink) Old 06-13-2014, 07:35 PM
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Yeah after doing the math I doubt the formula I found is correct.
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post #5 of 13 (permalink) Old 06-13-2014, 08:26 PM
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http://fishfriend.com/aquarium_co2_calculator.html KH of 210ppm and PH 7 is around 35ppm co2. For the most accurate reading co2 must be the only thing affecting ph.


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post #6 of 13 (permalink) Old 06-13-2014, 08:30 PM
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The math isn't the problem.

The problem is that the table doesn't take into account all the MANY other variables that can affect pH BESIDES CO2.

Get a drop checker with a calibrated 4dkH solution.





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post #7 of 13 (permalink) Old 06-13-2014, 08:38 PM Thread Starter
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Thanks everyone. I know Im getting enough to elicit a response, because it's obvious just from looking at my plants. I just find it hard to believe Im generating 30-something on a 75 with just three 2L bottles.

But like I said in the build thread I made , with a leak free system and good diffusion, I did expect better results than the general consensus seems to be.

Oh, and yeah I have a glass ADA drop checker ordered from Amazon, apparently though it's going to be 2-3 more weeks before it arrives :curse words: :curse words:

In the mean time, Im just trying to gauge the amount I have via number crunching


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post #8 of 13 (permalink) Old 06-13-2014, 08:38 PM
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Take a sample of the tank water, degas it for 24 hours. Then to a ph test. Post back what you get.
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post #9 of 13 (permalink) Old 06-13-2014, 09:07 PM Thread Starter
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Quote:
Originally Posted by thedarkfinder View Post
Take a sample of the tank water, degas it for 24 hours. Then to a ph test. Post back what you get.
That is exactly what I did. First reading was just a tad lower than 7.0 (keep in mind Im using dipsticks, so it's a best guess - at best)

24 hours later it was just shy of 8.0. I would estimate 7.8 or .9. Which happens to be the norm for my tap water, which is extremely hard and high PH.


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post #10 of 13 (permalink) Old 06-13-2014, 11:23 PM
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KH is measured in any of several ways.
Check the kit or sticks you are using. Probably telling you parts per million (PPM)

The pH/KH/CO2 chart is in German degrees of hardness.

1 degree = 17.9 ppm.
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post #11 of 13 (permalink) Old 06-14-2014, 05:46 AM
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Starting from the beginning: You use dip sticks to measure both pH and KH. Those are not very accurate, at best. Then you are just estimating that your KH is between 180 and 240, so you picked 210 as the number, but in reality it could be 170 or 250 or anything in between. So, forget the 17.9 conversion, and just use 20, which is easy to do in your head. Your KH, in degrees, is then likely to be between 9 and 12. Now, you are again estimating that your pH is 7, but it could easily be 6.8 to 7.2. So, if you use the table, determine what those extremes give you: pH 6.8, KH 12 or 57 ppm, and pH 7.2, KH 9 or 17 ppm. So, if your tank water contains nothing other than carbonates and CO2 that affect pH and KH, then you probably have from 17 to 57 ppm of CO2.

That's one of the reasons why it is impossible for us hobbyists, with only test kits for KH and pH, to measure how much CO2 we have. You can be sure you have some CO2 dissolved, and, since the fish aren't floating belly up, you probably have less than 57 ppm. To go any further with CO2 you would need a way to slowly adjust the CO2 bubble rate, so you could observe the plants and fish for several days for each adjustment, to see what effect it has.

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post #12 of 13 (permalink) Old 06-14-2014, 01:20 PM Thread Starter
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That clears up a lot of things, I understand better now. Thanks everyone.


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post #13 of 13 (permalink) Old 06-18-2014, 12:00 AM
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I may have gotten to a point somewhere close to what you are finding. I did the chart and got such a weird answer that I knew it was wrong, I did the drop checker and got nice colors but they really were not giving me much. I was using pressure CO2 qand had good control so , just fell back to what the fish were showing me. They are my priority and if they say "enough", there is no other measurement that will make me go higher. So I now just have a bubble counter to show I've not stopped flowing and stored the drop checker.
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