ppm of each ion added by dissolving 1 gram of the salt in 1 litre of water.
ppm =1000 × n_ion × M_ion / M_salt
(1 g/L is 1000 mg/L; 1/M_salt mol of salt releases n_ion mol of the ion,
each weighing M_ion g.) Divide by 3.785411784 to compare with the
per-US-gallon figures published by Palmer and Bru'n Water. Gypsum's 232.8
ppm Ca per g/L is their 61.5 ppm per g/gal.
ppm of each ion added by dissolving 1 gram of the salt in 1 litre of water.
(1 g/L is 1000 mg/L;
1/M_saltmol of salt releasesn_ionmol of the ion, each weighingM_iong.) Divide by 3.785411784 to compare with the per-US-gallon figures published by Palmer and Bru'n Water. Gypsum's 232.8 ppm Ca per g/L is their 61.5 ppm per g/gal.