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Water Characteristics

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Conversion between different data scales

Temperature
1 C = 33.8 F
1 F = -17.22 C
Volume
1 L = 0.26 gal
1 gal = 3.79 L
Size
1 cm = 0.39 in
1 in = 2.54 cm
Hardness
1 dH = 17.86 ppm
1 ppm = 0.6 dH

Water Hardness

Hardness = the amount of dissolved salts in water

 

dH

ppm or Mg/liter CaCO3

Soft

0-3

0-50

Moderately soft

3-6

50-100

Slightly hard

6-12

100-200

Moderately hard

12-18

200-300

Hard

18-25

300-450

Very hard

25+

450+

pH, Hydrogen power

pH = the concentration of hydrogen ions in water

Acidic

Neutral

Alkaline

+H

 

-H

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

   
 

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Copyright 1997-1998 Luben J. Petrov. All rights reserved