What Size Water Softener Do I Need? A Simple Sizing Formula
Quick Answer: To size a water softener, multiply your water hardness in grains per gallon (GPG) by your household's daily water use in gallons, then add a little iron if present. That gives you the grains of hardness to remove per day. Choose a unit whose capacity lets it regenerate once every three to seven days, not every single night. For a family of four at 10 GPG, you typically need a 32,000 to 40,000-grain softener. ...