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post #2 of (permalink) Old 08-01-2013, 03:21 PM
Darkblade48's Avatar
Join Date: Jan 2008
Location: Toronto/Singapore
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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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