Using 4dkh standard/solution to read co2 levels is the most accurate way of understanding the kH value of your aquarium which is affected by C02 levels.
Simply add 2ml or add enough solution to the chamber to fill the drop checker ball half.
Next add 3-5 drops of PH reagent in the chamber to achieve a blue colour. Place drop checker 15cm from the surface.
For the co2 reagent you can use your co2 indicator from your test kit, add 3-5 drops. Co2 reagent is not included.
Solution is clear and supplied in a green bottle as pictured.
Town: Whalley Range
County: Greater Manchester
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