API Tests - The Planted Tank Forum
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post #1 of 6 (permalink) Old 02-07-2017, 10:56 PM Thread Starter
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API Tests

So for the first time I used the API hardness test. But im not sure if Im reading it right.

For the KH it took me 3 drops to get it to turn yellow. Does this mean my KH is 3? that seems kinda low.
For my GH it took me 6 drops to get it to turn green. Does this mean my GH is 6? seems kinda low as well.
My ph is 7.8

Did I do the test wrong? or am I reading the GH and KH test results wrong?

If this is right, what does that mean for my fish and plants ? Thanks
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post #2 of 6 (permalink) Old 02-07-2017, 11:08 PM
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Test again. Test tap water. Test bottled water. See if you can get it to move around.Make sure that you have the method to test down, and then trust the results. Also make sure that the expiration dates haven't come and gone on the tests. They can get "wonky" after that. The best that you will probably ever get is a good reference on tests that you cannot calibrate, unless you have a degree in chemistry and a full lab to work with. Good luck.

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post #3 of 6 (permalink) Old 02-08-2017, 02:00 AM
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Quote:
Originally Posted by archangelvk View Post
So for the first time I used the API hardness test. But im not sure if Im reading it right.

For the KH it took me 3 drops to get it to turn yellow. Does this mean my KH is 3? that seems kinda low.
For my GH it took me 6 drops to get it to turn green. Does this mean my GH is 6? seems kinda low as well.
My ph is 7.8

Did I do the test wrong? or am I reading the GH and KH test results wrong?

If this is right, what does that mean for my fish and plants ? Thanks
If I remember right, No. Look in the instructions there is a conversion for drops to dkh


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post #4 of 6 (permalink) Old 02-08-2017, 02:35 AM Thread Starter
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If I remember right, No. Look in the instructions there is a conversion for drops to dkh
Yes it says that 3 drops = 0-50 ppm and 6 drops = 50-100 ppm. But what does that mean now?
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post #5 of 6 (permalink) Old 02-08-2017, 03:33 AM
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The conversion of ppm to dkg or dgh was covered in an old thread, see this - https://www.plantedtank.net/forums/11...h-ppm-dgh.html

Note that the conversion factor is 17.86, so seeing a range of 0-50 ppm or 50-100 ppm sounds really off because each reading covers almost 3 degrees of kh or gh.

Now in most system, this will not make too much difference, but there is always that one fish or other livestock where it's got to be just right. If you can't resolve this further, and you feel you must, consider another brand of test kit.
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post #6 of 6 (permalink) Old 02-08-2017, 03:43 AM
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I think it is important to understand resolution - these drops are meant to be applied to 5 ml of water and represent for 1 dKH/dGH for each drop.

A color change after 3 drops means your water is somewhere between 2 and 3 dKH/dGH.

If you want higher resolution, double the water to 10 ml, and each drop counts as .5 dKH/dGH. In this example, 5 drops would mean somewhere between 2 and 2.5 dKH/dGH.

Hopefully that gives some ideas on how to get a more accurate reading if needed.
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