Whole Home Water Filters: What They Remove and Which One to Buy
Not all filters are created equal. Understand the difference between filtering and softening, and know exactly what you need to remove from your water.
Filter vs. Softener: The Key Distinction
A common point of confusion is using the terms "water filter" and "water softener" interchangeably. They solve different problems, and a system built for one won't fix the other:
- Water Filters remove contaminants like chlorine, chloramines, VOCs, heavy metals (like lead), and sediment. They improve the taste, smell, and safety of your water but do not remove hard minerals (calcium and magnesium) — a filter alone won't stop scale buildup. For the mechanics of scale and hardness itself, see our water softener guide.
- Water Softeners strictly remove hard minerals to prevent scale buildup on fixtures, pipes, and appliances. They do not filter out chlorine, bad tastes, sediment, or contaminants like lead.
In practice, most homes on municipal water need both: chlorine/chloramine treatment for taste and safety, and softening for scale — which is why filter and softener functions are so often combined into one system.
What a Filter Should Remove, Checklist
- Chlorine & chloramines: The most common source of "pool water" taste and smell in city water — a standard carbon filter handles this well.
- Sediment: Sand and grit that clog aerators, valves, and appliance inlets. Look for a dedicated sediment pre-filter stage.
- Lead & heavy metals: Not removed by standard carbon media — you need a filter tank specifically rated for heavy metal reduction.
- Flow rate (GPM): Match the system's gallons-per-minute rating to your household's peak demand so filtering doesn't choke water pressure.
- Maintenance interval: Check how often the pre-filter and main media bed need replacing before you buy.
Do You Need the Combo?
If you are on city water, it is highly likely that you have both hard water and water treated with chlorine/chloramines — two separate problems that a filter-only system won't fully solve. In these cases, installing a Filter + Softener Combo is the most prudent choice, which is why it receives our top recommendation for the majority of residential applications. See our full system comparison for pricing across every configuration.