DIY Drop Checker For Under $1 - Page 2 - The Planted Tank Forum

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post #16 of 18 (permalink) Old 08-06-2009, 03:54 PM
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Originally Posted by Darkblade48 View Post
Not too sure what your problem is here; API doesn't make a 4 dkH solution.

Unless you meant to say that your reference solution immediately turns green when you add the API pH indicator (bromothymol blue) to it. If that is the case, either the test reagent is suspect, or the 4 dkH reference solution is not really 4 dkH.
Thanks for your patience with me Anthony. I am not so familiar with these test kits that is why. I am actually trying to use the KH (carbonate hardness) test solution of API by adding 4 drops of aquarium water to make it 4dkh. The moment I put the 4 drops of water. It turns green right away and no changes from there. I do not have that bromothymol blue. So it seems that the solution is not appropriate and will have to buy what you are recommending.

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post #17 of 18 (permalink) Old 08-06-2009, 11:10 PM
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Originally Posted by 4f1hmi View Post
I am actually trying to use the KH (carbonate hardness) test solution of API by adding 4 drops of aquarium water to make it 4dkh. I do not have that bromothymol blue. So it seems that the solution is not appropriate and will have to buy what you are recommending.
Yes, this is incorrect. The kH test kit does not have anything to do with this.

You need a reference solution that will measure 4 dkH. This can either be bought, or made yourself with sodium bicarbonate.

Once you have this reference solution, using the kH test solution, it should measure 4 dkH.

However, in order to properly use the 4 dkH reference solution in a drop checker, you will need bromothymol blue (the API regular pH test kit is this chemical).

Anthony

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post #18 of 18 (permalink) Old 08-07-2009, 06:06 AM
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Thanks a lot for your help Anthony! I am in the process of getting the solution.

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