Water Filter vs. Water Softener: Do You Need Both?
A filter and a softener solve different problems. Filtration targets substances specified for that filter. A salt-based softener removes hardness minerals, mainly calcium and magnesium. Choose filtration for your filtration goals; consider adding a softener when confirmed hardness and your preferences justify it.
What does each system do?
| Treatment | Main purpose | What to check |
|---|---|---|
| Whole-house filtration | Reduces the substances identified for the particular filter, such as specified taste or odor compounds. | The exact model’s performance claims and maintenance requirements. |
| Salt-based softening | Reduces calcium and magnesium hardness. | Your incoming hardness, water use and installation space. |
| Filter + softener | Combines the two treatment jobs. | Whether you want both, and whether the complete installation fits. |
The CDC describes water softeners and other home treatment methods separately because their functions differ. A system’s name alone does not establish what it removes.
Our standalone softener package includes pre- and postfilter cartridges, but it does not include the SMART filtration tank in the combined package. See the Whole Home Softener for its exact contents.
How do you know whether your water is hard?
Look for a hardness result from your actual water provider or a test of your incoming water. Hardness is usually reported in mg/L as calcium carbonate or grains per gallon. Ask your installer to interpret the result if the units are unclear.
| Hardness as calcium carbonate | Classification |
|---|---|
| 0–60 mg/L | Soft |
| 61–120 mg/L | Moderately hard |
| 121–180 mg/L | Hard |
| More than 180 mg/L | Very hard |
These categories come from the U.S. Geological Survey. Hardness is generally an aesthetic and maintenance concern; a “very hard” label is not, by itself, a finding that water is unsafe to drink.
No hardness result does not mean soft water. If your report does not confirm hardness, Clearhouse still lets you explore filtration. The softener stays optional while you ask your utility or arrange a test.
Which option should you consider?
- You want filtration, with no confirmed hardness concern: start with the Whole Home Filter and review its specific performance information.
- You want filtration and have confirmed hard water: consider the Whole Home Filter + Softener. Softening is still your choice.
- You already have suitable filtration and want softening: ask your plumber whether the Whole Home Softener fits your existing setup.
- You already have a working softener: check its condition before buying another. Your plumber can review how a filter would connect.
Choose the provider listed on your bill when viewing your water report. A county or ZIP code can include multiple water systems, so an area result should not automatically become a recommendation for every home.
What changes when you add a softener?
You add a brine tank, salt upkeep and regeneration settings to the installation. The manufacturer’s softener specifications identify the hardware and space requirements; your plumber should check them before you commit.
Compare the added equipment price, installation work and ongoing care against the hardness issues you actually want to address. There is no need to choose the combined package simply because it is available.
Common questions
Will the Whole Home Filter make my water soft?
The filter-only package does not include a hardness-removing softener. Choose the combined package if you decide you want both treatment stages.
Do I have to buy a softener if hardness is unknown?
No. Keep it optional and confirm your hardness before deciding.
Can I use a county water report for a private well?
A public utility’s result does not describe your private well. Start with a well-water test and a treatment review specific to that water.