Durognost Special Buffer Solution is a solution designed to buffer highly alkaline water samples, ensuring that analyses can be carried out reliably. For accurate analyses at high pH levels The Durognost Special Buffer Solution is a buffer solution for alkaline water samples. It is used to buffer strongly alkaline water samples (above pH 10) for the determination of total and residual hardness using Durognost and Duroval test kits. The contents of the bottle are sufficient for approx. 200 analyses. The Durognost Special Buffer Solution stabilises highly alkaline water samples and brings the pH value into a range that allows for accurate measurement. What is the buffer solution suitable for? The solution is not suitable for calibrating pH meters or as a general pH standard solution, but is used exclusively for buffering highly alkaline water samples. What is the buffer solution used for? Our buffer solution is used to adjust highly alkaline water samples (often with a pH value above 10) to a defined, lower pH value prior to titration or analysis, and to maintain this value. This is important for accurate measurement results, particularly when determining total and residual hardness, for example using DUROVAL® and DUROGNOST® test kits. Applications of the buffer solution The buffer solution is used wherever highly alkaline conditions would interfere with standard testing procedures. It facilitates accurate measurements by lowering the pH to a measurable range.

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. Indicator for determining residual hardness in water 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

Durognost SR 0 (0.1/0.05 °dH) Threshold test kit for the rapid determination of residual hardness. Threshold monitoring in the very low hardness range Special liquid indicator in a dropper bottle for monitoring the residual hardness of softened water, calibrated to the limit values of 0.1 and 0.05 °dH (1.79 and 0.89 ppm). Complete with measuring tubes and stoppers. Sufficient for approximately 250 analyses; the required measurement time is approx. 30 seconds. Identification of the hardness range When the indicator comes into contact with the water sample, it changes colour as soon as the specified limit values of 0.1 °dH or 0.05 °dH are reached or exceeded. How should the reagent be used? Please rinse the supplied measuring tube with the water sample. Then fill the measuring tube with the water sample up to the 5 ml or 10 ml mark. Add one drop of indicator and swirl the tube to dissolve it completely in the water sample. After a reaction time of approximately 30 seconds, the water sample will change colour. Water sample changes colour: Green = softened water is fine (within the defined range) Red = Regenerate the water softener Please read the supplied instructions for use before use.

Titration kit for the determination of water hardness via complexometric titration 1 drop corresponds to 1 degree of French hardnessAnalyses: approx. 30 (at an average hardness of 10 °f)   This product is available in following versions:  1 pcs.50 pcs. neutral inlays without folding box Kit for 50 pcs. neutral inlays without folding box 50 pcs. neutral inlays with neutral folding box

The Duroval A Test Kit 0–60 °f is a handy test kit for determining water hardness using complexometric titration. Precise determination of water hardness by titration The Duroval A test kit is suitable for determining water hardness across all hardness ranges by means of complexometric titration using a liquid titrant and a dosing pipette precisely calibrated in degrees of hardness. Complete with measuring tubes, liquid indicator, dosing pipette calibrated to 0–60° French hardness and 50 ml of titration solution. This test kit allows water hardness to be determined quickly. The kit provides approximately 100 analyses at an average hardness of 26.7 °f, with a measurement time of approx. 2 minutes and a measurement accuracy of 1 °f hardness. Use and special features of the test kit The test kit is particularly suitable for users who wish to determine water hardness values quickly without the need for technical equipment. It is a kit for chemical analysis that is straightforward to use.

The Duroval AF Test Kit 0–60 °f is a compact titration kit for determining water hardness in the range of 0 to 60 °f using a powdered indicator. Measuring water hardness with the test kit Kit for determining water hardness across all hardness ranges via complexometric titration using a liquid titrant and a dosing pipette precisely calibrated in degrees of hardness. Complete with measuring tubes, powdered indicator, dosing pipette calibrated to 0–60° French hardness and 50 ml of titrant. Tests: approx. 100 (at an average hardness of 26.7 °f) Measurement time: approx. 2 minutes Measurement accuracy: 1 °f The Duroval AF test kit determines water hardness quickly and accurately. Everything required for the determination is included in the set. Where can the test kit be used? The test kit is practical because no expensive equipment is required. It can be used at home, in the laboratory or even on the go. How do you use the Duroval AF titration kit? The Duroval method allows for a quick and straightforward determination of the total hardness of water without the need for additional equipment. The indicator turns a deep red in hard water. Adding the titration solution binds the total hardness, causing the colour to change from red to green. The volume of titration solution added with the measuring pipette until the colour change occurs serves as the basis for determining the water hardness. The total hardness of the water sample can then be read directly from the measuring pipette.

The Duroval TF test kit is a set for determining water hardness across the entire hardness range. With the pipette and titration solution, you can obtain reliable measurement results quickly. Test water hardness easily With the Duroval TF test kit, you can determine water hardness by titration and quickly identify whether your water is soft or hard. The kit is particularly suitable for initial set-up of water treatment systems. This allows you to keep an eye on water quality and react in good time. Application: Industrial kit for determining water hardness across all hardness ranges via complexometric titration using a titrant and a dosing pipette precisely calibrated in degrees of hardness. Fast results with compact equipment The test kit contains test tubes, powder indicator, a dosing pipette calibrated to 0–60 °f (French hardness) and 30 ml of titration solution. Tests: approx. 60 (at an average hardness of 26.7 °f) Testing time: approx. 2 minutes Accuracy: 1 °f The result is easy to read thanks to the clearly visible colour change.

The Duroval TI with pipette (0–60 °f) is a titration test kit for determining water hardness. With its liquid indicator and calibrated pipette, it delivers rapid results. Precise water hardness analysis with the Duroval test kit With the Duroval test kit, you can reliably determine the hardness of your water in French degrees of hardness without an electronic measuring device. The kit consists of a measuring tube, a stopper to seal the measuring tube, a liquid indicator, a calibrated dosing pipette (0–60 °f French hardness) and 30 ml of titration solution. Tests: approx. 60 (based on an average hardness of 26.7 °f) How does the test kit work? The Duroval method allows for a quick and straightforward determination of the total hardness of water, without the need for any additional equipment. In hard water, the indicator initially turns a deep red. When the titration solution is then added, it binds the hardness components, causing the colour to change from red to green. The volume of titration solution dispensed using the measuring pipette up to this colour change corresponds to the hardness of the water sample. The total hardness value can be read directly from the measuring pipette.