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Christof 08-01-2013 12:11 PM

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?

Darkblade48 08-01-2013 02:21 PM

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.

Christof 08-01-2013 02:52 PM

That's what I thought. Thanks for confirming.

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