REGION OF WATERLOOResidential Water Softener Performance Study 3 1 grain = 0.0648 grams; 1 grain per U.S. gallon = 17 mg per litre (or ppm) of hardness (calcium Medallist Series Automatic Water Conditioner, Model: Plus 30 … View Full Source
REGION OF WATERLOOResidential Water Softener Performance Study 3 1 grain = 0.0648 grams; 1 grain per U.S. gallon = 17 mg per litre (or ppm) of hardness (calcium Medallist Series Automatic Water Conditioner, Model: Plus 30 … View Full Source