Gh test issue - The Planted Tank Forum
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post #1 of 3 (permalink) Old 08-01-2013, 12:11 PM Thread Starter
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Gh test issue

I'm using a Nutrafin Gh test which requires adding drops until a visible color change happens. With this test, the difference between drops is a little over 1 dH. If I double the amount of water from 5ml to 10ml and count drops until color change and then divide by two will I get more accurate results? Are there Gh test kits out there that measure more accurate than 1dH increments?
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post #2 of 3 (permalink) Old 08-01-2013, 02:21 PM
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As GH and KH test kits work on the principle of titration, you can double the volume of water to be tested, and just keep adding drops until you see a colour change.

The result is that each drop resolves to a finer degree (i.e. each drop is now 0.5 degrees hardness, rather than a single point). Doubling the volume again would result in a resolution of 0.25 degrees, etc.


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post #3 of 3 (permalink) Old 08-01-2013, 02:52 PM Thread Starter
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That's what I thought. Thanks for confirming.
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