Water Filter Types Explained Simply
Compare how common water treatments work, what each one can and cannot do, and the trade-offs you should check before buying.
Six Ways Water Treatment Can Work
Not every filter works like a screen. Treatment may trap particles, adsorb chemicals, exchange ions, separate dissolved material, or inactivate microbes.
Particle screening
Sediment media trap sand, rust, and other particles larger than the filter openings.
Adsorption
Activated carbon holds certain chemicals on its large internal surface.
Membrane separation
UF and RO membranes separate different groups of contaminants under pressure.
Ion exchange
Special resin swaps selected dissolved ions for different ions.
UV disinfection
UV light inactivates susceptible microbes. It does not remove salts, metals, or sediment.
Scale conditioning
Some conditioners change how scale forms but do not remove calcium and magnesium.
⚙️ Choose a Technology to Inspect
Under-Sink Tankless Reverse Osmosis
The modern pinnacle of residential drinking water filtration: instant high flow, zero stale tank water, 99%+ contaminant rejection, compact footprint.
✓ Engineering Advantages
- •Removes virtually all known contaminants: PFAS, Lead, Fluoride, Microplastics, Arsenic, Nitrates
- •Saves 70% under-sink cabinet space compared to bulky tank systems
- •Smart real-time TDS display on faucet and filter lifetime indicators
- •No risk of secondary bacterial growth inside pressurized rubber bladder tanks
⚠ Physical Constraints
- •Requires an electrical outlet under the sink for internal booster pump
- •Higher upfront price than traditional tank RO
- •Requires drilling a small faucet hole unless replacing a soap dispenser