"Hard" water is water with high concentrations of dissolved calcium and magnesium. It's not a health issue, but it's hell on plumbing. The minerals deposit on every surface they touch: pipe walls, water heater elements, faucet aerators, dishwasher heaters, washing machine valves. Over years, the deposits build into scale that restricts flow and burns out appliances.
Signs you have hard water
- White crust on faucets, showerheads, and around the rim of toilets.
- Spots on dishes after a normal dishwasher cycle, even with rinse aid.
- Soap that won't lather. Hard water reacts with soap to form scum instead of suds.
- Stiff laundry and faded colors after washing.
- Itchy skin and dull hair after showering — mineral residue on the skin.
- Reduced water pressure over time as scale narrows the pipes.
- Water heater that pops or rumbles. Sediment is collecting at the bottom of the tank.
How to confirm it
Hard water is measured in grains per gallon (gpg) or parts per million (ppm). 1 gpg ≈ 17 ppm.
- 0–3 gpg: soft
- 3–7 gpg: moderately hard
- 7–10 gpg: hard
- 10+ gpg: very hard
Cheap test strips ($10) give you a number in 30 seconds. Your municipal water utility also publishes an annual water quality report that lists hardness — search for "[your city] water quality report". On well water, get a lab test; readings vary across the year.
What it actually costs you
- Water heater life: 30–50% shorter. Scale insulates the heating element so it works harder for the same temperature.
- Energy bill: a quarter inch of scale on a heating element drops efficiency by ~25%.
- Appliance repairs: dishwashers, washing machines, ice makers all fail earlier.
- Soap and detergent: you use 30–50% more.
- Plumbing fixtures: aerators, valves, and cartridges need replacing every few years instead of decades.
The fixes
Salt-based ion-exchange softener
The standard solution. Resin beads swap calcium and magnesium for sodium ions, then regenerate periodically using salt brine. Pros: highly effective, removes hardness completely. Cons: adds a small amount of sodium to the water (negligible for most people, but consider drinking-water bypass if on a strict low-sodium diet), wastes some water during regeneration, and discharges brine.
Salt-free conditioner (template-assisted crystallization)
Doesn't remove minerals — converts them into a crystalline form that doesn't stick to surfaces. Pros: no salt, no waste water, low maintenance. Cons: not a true softener; you'll still see some spotting. Best for moderate hardness or when salt isn't an option.
Reverse osmosis (drinking water only)
An under-sink RO system removes minerals at the tap for cooking and drinking. Combine with a whole-house softener — the softener protects the plumbing, RO gives you clean drinking water.
What size do you need?
The capacity calculation is straightforward:
People in household × 75 gallons/day × hardness (gpg) = grains per day
Multiply by 7 to size for a weekly regeneration. A family of four with 10 gpg water needs a softener rated around 21,000 grains. Oversized softeners regenerate less often and use less salt — usually worth bumping up one size.
Maintenance
- Top off salt every 6–8 weeks. Don't let the brine tank go empty.
- Clean the brine tank annually to remove sediment.
- Replace the resin bed every 10–15 years.
- Flush your water heater at least annually — even with a softener, some sediment accumulates.
Not sure what you have or what you need? We test water for free, size systems based on actual usage, and install softeners with a workmanship guarantee.