Water hardness

Converter mmol/L ↔ ppm ↔ °dH ↔ °Ж ↔ gpg + scale verdict

Measurement

°Ж (Ukraine): 1°Ж = 0.5 mmol/L. °dH = 0.178 mmol/L. 1 gpg = 17.1 ppm. Limits: drinking ≤7 mmol/L (UA), washing machines like <1.5.

Verdict

Medium — moderate scale

2,5 mmol/L

In other units

  • mmol/L2,5
  • ppm (mg/L CaCO₃)250
  • °dH (German)14
  • gpg (grains/gal)14,6