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Carbonate hardness
0-9 A B C D E F G H I K L M N O P R S T U V W Z
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Carbonate hardness

1° dH Carbonate hardness corresponds to: 0.36 mmol/l Hydrogen carbonate ions (HCO3-) calculated from the acid binding capacity (SBV / buffer capacity) in mmol/l × 2.8

In water management, by definition, only the proportion of hydrogen carbonate ions that have an alkaline earth ion as their mathematical counterpart is counted as carbonate hardness. Therefore, the KH can never be greater than the total hardness can never be greater than the total hardness.
However, the SBV is more important in aquaristic terms, as it indicates a value for the buffering capacity of the water.

White plastic bottle "pH/KH-Minus" from DRAK-Aquaristik with orange labelling. Solution for lowering the pH value in the aquarium. Filling quantity: 250ml.
DRAK pH/KH-Minus - reduce pH and KH quickly and easily
Convenient and safe reduction of KH. Quick and easy to dose.

Variants from €8.95*
€0.00*
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White tin with blue label and "Duradrakon" lettering. Hardening salt for osmosis water, 100g content. DRAK-Aquaristik Logo recognisable.
Duradrakon hardening salt
GH & KH hardening salt mixture for reverse osmosis water

Variants from €8.20*
€0.00*
Details
White tin of Duradrakon KH-Plus 100g from DRAK-Aquaristik with blue-green label. The label shows fish and the product name.
Duradrakon KH-Plus to increase the KH and pH
Very economical. Dissolves easily and without clouding.

Variants from €5.95*
€0.00*
Details
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Packaging of the PRODACtest KH carbonate hardness test. Picture shows the pack with fish and aquarium plants. Includes reagent bottle and cuvette.
PRODACtest KH - Carbonate hardness test
Determination of carbonate hardness (KH). For fresh and salt water.

€11.99*
Details
Sold out
Packaging of the PRODACtest pH test 4.5-9.0 with colourful fish. Bottle and cuvette for pH value determination.
PRODACtest pH - measuring range 4.5 - 9.0
Determination of the pH value. For freshwater and seawater. Up to 130 applications.

€10.90*
Details
Tip
Packaging of the ZooBest Alpha Test KH (carbonate hardness) test kit. Fish are pictured on the packaging. Carbonate hardness text is visible.
ZooBest Alpha Test Carbonate Hardness - KH
Determination of carbonate hardness (KH). For fresh and salt water.

€6.95*
White dropper bottle with blue label. The label reads: ZooBest Alpha Test KH (carbonate hardness).
ZooBest Alpha Test Carbonate hardness (KH) replacement reagent
10 ml KH test replacement reagent

Content: 0.01 Litre (€495.00* / 1 Litre)

€4.95*
Packaging of the ZooBest Alpha Test pH 4-9. The packaging shows a waterfall with the text "pH-Test 4-9" above it.
ZooBest Alpha Test pH 4 - 9
For determining the pH (4 - 9). For fresh and sea water.

€7.49*
White plastic bottle with blue label. The label reads "ZooBest Alpha Test pH". Below the logos it says "pH value 4-9".
ZooBest Alpha Test pH 4 - 9 Replacement reagent
10 ml pH test replacement reagent

Content: 0.01 Litre (€549.00* / 1 Litre)

€5.49*