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Z166464 Aldrich

Aquadur® test strips

Water hardness, pkg of 100 ea

Synonym: water hardness, water quality



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packaging   pkg of 100 ea
mfr. no.   Macherey-Nagel
color   green change


General description

Aquadur water hardness test strips are the ideal choice to quickly, easily and reliably determine water hardness. In many industries water hardness is an important parameter in process control and has to be monitored constantly, for example in the textile industry, water works, fish-farming and aquaculture.

<55, >90, >180, >270, >360, >445ppm

The hardness of water is expressed in mmol/l or in the older common unit degrees of hardness, whereby it is important to differentiate between German, English and French interpretation:

in Germany: 1 °d = 10 mg/l CaO = 17.8 mg/l CaCO3
in Great Britain: 1 °e = 14.3 mg/l CaCO3
in France 1 °f = 10 mg/l CaCO3
Conversion factors: 1 °d = 1.25 °e = 1.78 °f = 0.178 mmol/l

In the USA, the water hardness is expressed as ppm (mg/l) CaCO3. Generally, water is often simply classified as "soft water", or "hard water" , the following values apply to these terms:

below 50 ppm CaCO3 - very soft water
50 − 120 ppm CaCO3 - soft water
120 - 240 ppm CaCO3 - medium hard water
240 - 360 ppm CaCO3 - hard water
above 360 ppmCaCO3 - very hard water

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Aquadur is a registered trademark of Macherey-Nagel GmbH & Co., KG

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