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The most accurate and cost effective way of understanding the kH value of your aquarium which is effected by C02 levels.
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This solution can be used with all drop checkers.
In order for this solution to work correctly, it requires bromothymol blue (not supplied) which reacts with the 4dKH solution and changes colour according to the amount of C02 in your tank.
Please see our article on measuring CO2 with a drop checker http://www.aquariumplantfood.co.uk/fertilisers/pdf-downloads-1/pdf-downloads/co2-measurement-using-a-drop-checker-article.html
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