Size your water softener with real math, not a sales pitch.
Size your water softener with real numbers: your hardness, your household, the math shown.
Open the sizing calculator Read the guides
✓ Specs and prices cited to official pages, with dates ✓ NSF listings checked at the source ✓ No hands-on testing claims
Know your water
Find your hardness in your utility's annual water quality report, or test a private well at a state-certified lab.
How to find it →Run the numbers
Grains per day, recommended capacity, and regeneration interval, with gpg/ppm conversion and an iron adjustment.
Calculator →Check the certificate
Look up NSF/ANSI claims in NSF's own listings. "Certified components" isn't the same as a certified system.
Certifications →Latest guides
Water Softener and Your Water Heater: Scale, Anode Rods, and Tankless Limits
What U.S. Department of Energy research and A. O. Smith's own bulletin say about hard water, softened water, anode rods, and tankless heater hardness limits.
Read the guide →TroubleshootingWater Softener Not Softening? Troubleshooting Hard Water, a Brine Tank Full of Water, and Salty Taste
A symptom-by-symptom checklist from three softener makers' own troubleshooting charts: hard water, a brine tank full of water, salty taste, and low pressure.
Read the guide →CabinsWater Softener at a Cabin or Seasonal Home: Winterizing, Shutdown, and Spring Startup
How to leave a softener at a lake place or seasonal home: keep it heated or drain it, what makers say about freezing, and how to restart and sanitize it in spring.
Read the guide →SepticWater Softeners and Septic Systems: Does Softener Discharge Hurt a Septic Tank or Drainfield?
What the research says about softener brine in a septic system, why salt efficiency matters most, when advanced units differ, and Minnesota disposal options.
Read the guide →SaltWater Softener Salt Types: Pellets vs Crystals vs Rock Salt vs Potassium Chloride (and How to Fix a Salt Bridge)
Which salt to buy for a softener, what purity numbers mean, why rock salt leaves sludge, what potassium chloride really costs, and how to find and break a salt bridge.
Read the guide →InstallationWater Softener Installation Checklist: Where It Goes, the Bypass Valve, the Drain Line, and the Air Gap
Where a softener goes in the plumbing, why it needs a bypass, how the drain line and air gap work, what to do with the brine overflow, and when a license applies.
Read the guide →Health note: Not health or medical advice. A water softener treats hardness; it is not a health device. To know what is in your water, read your utility’s annual water quality report (Consumer Confidence Report) or, for a private well, get a test from a state-certified lab. For health questions, talk to your local health department or doctor.