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WATER TECHNIQUE - CONVERSION OF WATER HARDNESS UNITS.
The AQUA CORRECT conditioners are European Technical Approved - and Certified According to ISO 9001:2000.

Hard water, lime scale deposits and corrosion prevention.

TECHNOLOGY IN HARMONY WITH NATURE AND ENVIRONMENTAL SAFE.

Other useful Information about Water Hardness, Click: Hardness in Natural Water

CONVERSION OF WATER HARDNESS UNITS

Water Hardness

Unit


 Definition

International

mmol/liter

Physical measures

mval/liter

America & states

PPM

English

oe

French

of

German

odH

100mg CaCO3
per 1000 ml water

28 mg CaO or 50 mg CaCO3
per 1000 ml water

1 part CaCO3 per million = 1 mg CaCO3
per 1000 ml water

1 grainCaCO3 per gallon= 14,3 mg CaCO3 per 1000 ml water

10 mg/ CaCO3 per 1000 ml water

10 mg/CaO  per 1000 ml water

1 mmol/litre

1 mval/litre

1 PPM

1 Oe

1 Of

1 OdH

1

0,5

0,01

0,1429

0,10

0,1786

2

1

0,02

0,285

0,20

0,357

100

50

1

14,29

10,00

17,86

7,0

3,5

0,070

1

0,700

1,250

10,00

5,00

0,10

1,429

1

1,786

5,6

2,8

0,056

0,7999

0,5599

1

WATER H2O HARDNESS

TEMPORARY HARDNESS: Ca AND Mg BICARBONATES (precipitate minerals upon heating)

PERMANENT HARDNESS: Ca AND Mg SULFATES OR CHLORIDES (dissolve with sodium)

DEGREE OF HARDNESS EXPRESSION.

SOFT: LESS THAN 1,6 mmol/l = 160 PPM = 9 odH

SLIGHTLY HARD: 1,6-3,2 mmol/l = 160-320 PPM = 9-18 odH

HARD: 3,2-4,6 mmol/l = 320-460 PPM = 18-26 odH

VERY HARD: ABOVE 4,6 mmol/l = ABOVE 460 PPM = ABOVE 26 odH

Link to related information: The physical properties of water hardness.

Return to the index page

 THE UNIQUE CHEMICAL FREE TECHNIQUE, SAFE FUNCTION AND NO PRESSURE LOSS. A LOOK INSIDE THE AQUA CORRECT GUARANTEE A FULL FREE, SMOOTH LIQUID FLOW. THE OFFICIAL FUNCTION TEST REPORTS BY SCIENTIFIC INSTITUTES ARE WORLDWIDE AVAILABLE. MATERIALS: THE BEST QUALITY ACID-DURABLE ASTM A 316Ti STAINLESS STEEL.

The AQUA CORRECT unique physical features: Internal free flow - No pressure loss - No turbulence

NIELSEN TECHNICAL TRADING ApS - P.O.Box 10
DK-4621 Gadstrup - Denmark
nielsen@nielsen.dk