API KH test kit - Anyone with experience? Measuring CO2 Amounts - Page 2 - Equipment - Aquatic Plant Central

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Old 01-01-2012, 09:01 PM   #11 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

haha indicator is showing yellow right now but i havent tested the dkh of the distilled gallon...i just copied someones recipe but i guess i should spend some time to do that

Also co2 indicator is yellow, but im getting signs of black beard algae...soo somethings not right here

will update once problem is solved :P

thanks for all of the inputs it helps alot ^^
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Old 01-03-2012, 07:14 PM   #12 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

Check out LaMotte's KH/Alkalinity test kit for an excellent and accurate KH test kit. It can change color twice. You have the beginning color, the end point color and the past end point color. I really like it. I use it for testing my 4 dKH solutions. You can even get refills for it. It is sensitive to 4 ppm or 0.22 dKH. It has an easy to use direct reading titrator.

instructions: http://lamotte.com/images/pdfs/instructions/4491-dr.pdf

kit: http://www.marinedepot.com/LaMotte_K...FITKAL-vi.html

refill: http://www.marinedepot.com/LaMotte_K...FITKAL-vi.html
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Old 01-03-2012, 09:39 PM   #13 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

thanks Left C but i think i found out how to use the API brand...after a test or two you get use to it haha.
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Old 01-04-2012, 06:22 AM   #14 (permalink)
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not sure if this was covered but i found this guy to be helpful


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Old 01-04-2012, 07:32 AM   #15 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

haha thanks but i use something similar ^^ or probably that exact chart except in black and white :P
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Old 01-04-2012, 07:23 PM   #16 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

Quote:
Originally Posted by AheartlessFish View Post
thanks Left C but i think i found out how to use the API brand...after a test or two you get use to it haha.
The KH kit is easy after you get the hang of it. I hate their GH test kit. It is a little hard to tell the color change.

The API kit is accurate to 1 or 2 dKH which is approximately 18 to 36 ppm. The LaMotte kit is much more accurate at 0.22 dKH or 4 ppm.

I use both KH kits. I just like the accuracy of the LaMotte kit when making my dKH solutions. For testing my tap water or aquarium water, the API kit is good enough. My KH is very low, so I don't really worry with it.

Hagen's KH and GH test kits are decent. They use different reagents than API uses. Hagen's kit measures in ppm. 17.86 ppm = 1 dKH

Do you have any lab equipment (scales and volumetric measuring containers)? If so, both dutchy and billionzz wrote some very good directions for making up 4 dKH solutions.
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Old 01-05-2012, 06:00 PM   #17 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

OP you CANNOT make an accurate indicator by using tank water. you HAVE to use distilled or RO water. that is why your readings are off.
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Old 01-05-2012, 06:36 PM   #18 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

yea i figured that much, like i stated in previous post i went out and got some distilled water...and the 1/12 tsp baking soda per 1 gallon of distilled water gives me a perfect solution of 4dkh water.

Good news, my indicator now shows green and it has never done that ^^. I have a gallon of solution now added to my supply

Thanks everyone for their inputs helped alot.
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Old 01-07-2012, 11:27 AM   #19 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

Im not sure if you are tying to make a certain dkh reagent to add to a drop checker or if you are trying to use your pH and kH to determine what the levels of co2 are in your tank.

Here is what I can say about both scenarios.

If you are trying to make a specific dkh reagent yourself that is fine. I tried my hand at it and became extremely frustated by the process and just ended up purchasing a lab certified soloution that I know 100% is accurate.

Now if your trying to determine your co2 levels by using the pH/kH chart that is just not a good idea at all. It has long been proven that this method of trying to determine co2 saturation is horribly inaccurate due to so many different buffers (driftwood/reactive substrate/hard scape/co2 injection/and any water parameter altering products you could be using like peat and so many other things) that could be in your tank water that will throw off the reading/result you get you actually have a better chance guessing or pulling a ppm out of the thin air than using the pH/kH chart.
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Old 01-07-2012, 05:20 PM   #20 (permalink)
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Default Re: API KH test kit - Anyone with experience? Measuring CO2 Amounts

Well this post was originally about the Azoo indicator.

I ended up making a 4.0dkh solution with a gallon of distilled water and 1/12 tsp of baking soda formula

it works great and i get 4.0dkh when i test the distilled water. Wether the api test kit is 100 % accurate or not is a different story.

I got the solution to work in my indicator and im assuming thats the method you would recommend.

as for the PH/KH method, i just happen to have the KH test kit and i used the co2 chart which others are using as well. wether that is acurate or not is another story as well.

Combined with both methods of co2 indication, its showing good levels (30-40ppm)

What methods do you use since ur saying the PH/KH method isnt accurate?
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