Water softeners are rated by “grain capacity.” That’s how many grains they can remove before regenerating (cleaning themselves). A common size is 32,000 grains.
But here’s a sneaky truth: bigger isn’t better. A massive unit will regenerate less often, which sounds great—until you realize it wastes salt and water.
You want a sweet spot. For a family of four with hard water (10 GPG), a 32,000-grain unit works. For two people, a 24,000-grain model might be perfect.
