DEGREES OF WATER HARDNESS
degrees of water hardness: translation
dGH (water hardness expressed in degrees of hardness. 0-4 is very soft, 5-8 soft, up to 30 which is extremely hard water). Note that different countries use different measures: 1 English (Clark) degree is 14.3 p.p.m. calcium carbonate, 1 American degree is 17.1 p.p.m. calcium carbonate and 1 French degree (fh) is 10.0 p.p.m. calcium carbonate. However 1 German degree (dh) is 17.9 p.p.m. calcium oxide. Confusingly the German dh is used generally for degrees of hardness