DUROGNOST® I (0-0.1 °dH / 0-2 ppm / 0.2°F) powder limit indicator

The DUROGNOST® I (0–0.1 °dH / 0–2 ppm / 0.2 °F) powder test kit is designed for the rapid colorimetric determination of residual hardness in water.
Analyses: approx. 700

Special indicator in powder form for the rapid colorimetric determination of the slightest traces of hardness in the range of 0–0.1 °dH or 0–2 ppm CaCO₃ or 0.2 °f (French hardness). Complete with measuring tubes and dosing spoon.

With the Durognost I Powder Limit Test Kit, you can easily determine whether your water exceeds a specific limit value. The kit uses a powdered indicator that reacts when mixed with water.

The test kit is suitable if you want to check quickly and without complicated measurements whether water is harder than a specified value. It is not suitable if you require exact numerical values for water hardness.

Easy water hardness testing

The test kit uses a chemical indicator that changes colour depending on the threshold value reached. This gives you a clear result without the need for any equipment.

How do I use the indicator?

Dissolve 50 mg (one level measuring spoon) of DUROGNOST I indicator in 10 ml of practically completely softened water. The resulting colours correspond to the following values:

• Green colour: 0 °dH
• Grey colour: approx. 0.025 °dH
• Violet-tinged grey colour: approx. 0.05 °dH
• Red colour: approx. 0.1 °dH and above