Coverage: Whole House vs Under-Sink
Here is the key difference in coverage:
| Feature | Whole House Filter | Under-Sink Filter |
| Coverage | All faucets, showers, appliances | Kitchen faucet only |
| Flow rate | 10-25 GPM | 1-2 GPM |
| Best for | Chlorine, sediment, shower, laundry | Drinking water, cooking |
| Installation | Main water entry point | Under kitchen sink |
| Cost | $800-2,500 installed | $200-1,500 installed |
Cost Comparison
Here is the 20-year cost comparison:
| Cost Factor | Whole House Only | Under-Sink Only | Both |
| Upfront cost | $800-2,500 | $200-1,500 | $1,000-4,000 |
| 20-year maintenance | $3,000-8,000 | $200-1,500 | $3,200-9,500 |
| 20-year total | $3,800-10,500 | $400-3,000 | $4,200-13,500 |
Effectiveness
Here is how each system compares for contaminant removal:
- Chlorine removal: Whole house carbon block removes 95-99%. Under-sink carbon removes 95-99%. Both are equally effective.
- Sediment removal: Whole house sediment pre-filter removes 90%+ of particles. Under-sink sediment pre-filter removes 90%+ of particles. Both are equally effective.
- Heavy metals (lead, mercury): Whole house carbon block removes 50-70%. Under-sink reverse osmosis removes 95-99%. RO is significantly better.
- Bacteria/viruses: Neither whole house nor under-sink carbon removes bacteria or viruses. Only RO or UV treatment does.
Which System Is Right for You?
Choose based on your needs:
- Whole house filter alone: Best for chlorine/sediment removal from all water. Ideal for shower experience, laundry, and plumbing protection. Cost: $800-2,500 installed.
- Under-sink filter alone: Best for drinking water quality. Ideal for homes with low chlorine/sediment levels. Cost: $200-1,500 installed.
- Both whole house + under-sink: Best for comprehensive protection. Whole house removes chlorine/sediment. Under-sink RO provides the cleanest drinking water. This is the gold standard for Orlando homes. Cost: $1,000-4,000 installed.
Bottom line: Most Orlando homes benefit from both a whole house filter and an under-sink reverse osmosis system. The whole house filter removes 95-99% of chlorine and sediment from all water, protecting plumbing and improving shower quality. The under-sink RO system provides the cleanest drinking water, removing 95-99% of heavy metals and contaminants. For the best results, install both: whole house for $800-2,500 and under-sink RO for $200-1,500, totaling $1,000-4,000 installed.
What is the difference between whole house and under-sink filters?
Whole house filters treat all water entering the home — every faucet, shower, and appliance. Under-sink filters treat water at a single faucet (kitchen only). Whole house removes chlorine, sediment, and contaminants from all water. Under-sink is better for drinking water specifically, often paired with a whole house filter for broader protection.
Do I need both whole house and under-sink filters?
Yes, many Orlando homeowners use both. A whole house filter removes chlorine and sediment from all water (shower, laundry, dishwashing). An under-sink reverse osmosis (RO) system provides the cleanest drinking water. This combination is the gold standard for Orlando homes.
Which is better: whole house or under-sink filter?
It depends on your goals. Whole house is better for skin health, shower experience, and plumbing protection. Under-sink is better for drinking water quality and taste. For the best results, install both: whole house for chlorine/sediment removal and under-sink RO for drinking water.
How much does a whole house water filter cost in Orlando?
A quality whole house water filter in Orlando costs $650-2,650 installed, including the system, professional installation, and permit. Budget single-stage systems start at $650-1,250. Multi-stage systems with sediment pre-filter and carbon block cost $1,150-2,650. Annual maintenance is $150-400 for filter replacements.
Can I install a whole house filter with an under-sink filter?
Yes, this is the most common combination. The whole house filter goes at the main water entry point. The under-sink filter (usually reverse osmosis) goes at the kitchen sink. The whole house filter protects the under-sink system from chlorine and sediment, extending its lifespan.