The 30-Second Verdict
Whole house filtration treats all water in the home (showers, laundry, appliances); under-sink treats only drinking/cooking water. For Florida's hard water and chlorine taste, most homeowners benefit from both—a whole-house softener/filter plus a point-of-use RO for drinking.
Head-to-Head Breakdown
Whole House Water Filtration
Pros
- Treats ALL water entering the home—showers, laundry, appliances, and drinking
- Protects appliances (water heater, washing machine) from scale and sediment
- Removes chlorine from shower water (reduces skin and hair dryness)
- Single point of maintenance rather than multiple filters
- Required for full protection against Florida's sulfur and iron issues
Cons
- Higher upfront cost ($800-$3,000+ for quality systems)
- Requires professional installation in most cases
- Some filtration types (softeners) require ongoing salt/media replacement costs
- Not as effective as RO for removing certain contaminants like nitrates and PFAS from drinking water
Under-Sink (Point-of-Use) Filtration
Pros
- Lower upfront cost ($150-$800 for most systems)
- Excellent filtration for drinking water (RO removes 95%+ of contaminants)
- DIY installation possible for many under-sink systems
- Addresses taste, odor, and health concerns for drinking/cooking water
- No whole-home impact to water chemistry or flow
Cons
- Only treats water at one tap—showers, laundry, and appliances receive untreated water
- Doesn't address scale buildup in water heater or other appliances
- Small tank capacity—some RO systems produce water slowly
- Filter replacement required every 6-12 months
Side-by-Side Comparison
| Whole House Water Filtration | Under-Sink (Point-of-Use) Filtration | |
|---|---|---|
| Coverage | All water entering the home | Single tap (drinking/cooking only) |
| Upfront Cost | $800-$3,000+ installed | $150-$800 (RO systems) |
| Operating Cost | $100-$400/year (salt, filters) | $50-$150/year (filter replacements) |
| Installation | Professional recommended | DIY possible for most under-sink systems |
| Contaminant Removal | Sediment, chlorine, hardness, iron, sulfur (system-dependent) | RO removes 95%+ of most contaminants including nitrates, PFAS, arsenic |
| Appliance Protection | Yes—prevents scale in water heater, dishwasher, etc. | No |
| Florida Best Use | Homes with well water or noticeable hardness/taste issues | Municipal water users wanting clean drinking water |
Frequently Asked Questions
q
a
q
a
q
a